1 <?xml version="1.0" encoding="UTF-8" standalone="no"?> 2 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>Chapter1.Status</title><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><meta name="keywords" content="ISO C++, library" /><meta name="keywords" content="ISO C++, runtime, library" /><link rel="home" href="../index.html" title="The GNU C++ Library" /><link rel="up" href="intro.html" title="PartI. Introduction" /><link rel="prev" href="intro.html" title="PartI. Introduction" /><link rel="next" href="license.html" title="License" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter1.Status</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="intro.html">Prev</a></td><th width="60%" align="center">PartI. 3 Introduction 4 5 </th><td width="20%" align="right"><a accesskey="n" href="license.html">Next</a></td></tr></table><hr /></div><div class="chapter"><div class="titlepage"><div><div><h2 class="title"><a id="manual.intro.status"></a>Chapter1.Status</h2></div></div></div><div class="toc"><p><strong>Table of Contents</strong></p><dl class="toc"><dt><span class="section"><a href="status.html#manual.intro.status.iso">Implementation Status</a></span></dt><dd><dl><dt><span class="section"><a href="status.html#status.iso.1998">C++ 1998/2003</a></span></dt><dd><dl><dt><span class="section"><a href="status.html#iso.1998.status">Implementation Status</a></span></dt><dt><span class="section"><a href="status.html#iso.1998.specific">Implementation Specific Behavior</a></span></dt></dl></dd><dt><span class="section"><a href="status.html#status.iso.2011">C++ 2011</a></span></dt><dd><dl><dt><span class="section"><a href="status.html#iso.2011.specific">Implementation Specific Behavior</a></span></dt></dl></dd><dt><span class="section"><a href="status.html#status.iso.2014">C++ 2014</a></span></dt><dd><dl><dt><span class="section"><a href="status.html#iso.2014.specific">Implementation Specific Behavior</a></span></dt><dd><dl><dt><span class="section"><a href="status.html#iso.2014.filesystemts">Filesystem TS</a></span></dt></dl></dd></dl></dd><dt><span class="section"><a href="status.html#status.iso.2017">C++ 2017</a></span></dt><dd><dl><dt><span class="section"><a href="status.html#iso.2017.specific">Implementation Specific Behavior</a></span></dt><dd><dl><dt><span class="section"><a href="status.html#iso.2017.par2ts">Parallelism 2 TS</a></span></dt></dl></dd></dl></dd><dt><span class="section"><a href="status.html#status.iso.2020">C++ 2020</a></span></dt><dt><span class="section"><a href="status.html#status.iso.2023">C++ 2023</a></span></dt><dt><span class="section"><a href="status.html#status.iso.tr1">C++ TR1</a></span></dt><dd><dl><dt><span class="section"><a href="status.html#iso.tr1.specific">Implementation Specific Behavior</a></span></dt></dl></dd><dt><span class="section"><a href="status.html#status.iso.tr24733">C++ TR 24733</a></span></dt><dt><span class="section"><a href="status.html#status.iso.specfun">C++ IS 29124</a></span></dt><dd><dl><dt><span class="section"><a href="status.html#iso.specfun.specific">Implementation Specific Behavior</a></span></dt></dl></dd></dl></dd><dt><span class="section"><a href="license.html">License</a></span></dt><dd><dl><dt><span class="section"><a href="license.html#manual.intro.status.license.gpl">The Code: GPL</a></span></dt><dt><span class="section"><a href="license.html#manual.intro.status.license.fdl">The Documentation: GPL, FDL</a></span></dt></dl></dd><dt><span class="section"><a href="bugs.html">Bugs</a></span></dt><dd><dl><dt><span class="section"><a href="bugs.html#manual.intro.status.bugs.impl">Implementation Bugs</a></span></dt><dt><span class="section"><a href="bugs.html#manual.intro.status.bugs.iso">Standard Bugs</a></span></dt></dl></dd></dl></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="manual.intro.status.iso"></a>Implementation Status</h2></div></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="status.iso.1998"></a>C++ 1998/2003</h3></div></div></div><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="iso.1998.status"></a>Implementation Status</h4></div></div></div><p> 6 This status table is based on the table of contents of ISO/IEC 14882:2003. 7 </p><p> 8 This section describes the C++ support in 9 the GCC 14 release series. 10 </p><div class="table"><a id="table.cxx98_status"></a><p class="title"><strong>Table1.1.C++ 1998/2003 Implementation Status</strong></p><div class="table-contents"><table class="table" summary="C++ 1998/2003 Implementation Status" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /></colgroup><thead><tr><th align="left">Section</th><th align="left">Description</th><th align="left">Status</th><th align="left">Comments</th></tr></thead><tbody><tr><td align="left"> 11 <span class="emphasis"><em>18</em></span> 12 </td><td colspan="3" align="left"> 13 <span class="emphasis"><em>Language support</em></span> 14 </td></tr><tr><td align="left">18.1</td><td align="left">Types</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.2</td><td align="left">Implementation properties</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.2.1</td><td align="left">Numeric Limits</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">18.2.1.1</td><td align="left">Class template <code class="code">numeric_limits</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.2.1.2</td><td align="left"><code class="code">numeric_limits</code> members</td><td align="left">Y</td><td class="auto-generated"></td></tr><tr><td align="left">18.2.1.3</td><td align="left"><code class="code">float_round_style</code></td><td align="left">Y</td><td class="auto-generated"></td></tr><tr><td align="left">18.2.1.4</td><td align="left"><code class="code">float_denorm_style</code></td><td align="left">Y</td><td class="auto-generated"></td></tr><tr><td align="left">18.2.1.5</td><td align="left"><code class="code">numeric_limits</code> specializations</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.2.2</td><td align="left">C Library</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.3</td><td align="left">Start and termination</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.4</td><td align="left">Dynamic memory management</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.5</td><td align="left">Type identification</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">18.5.1</td><td align="left">Class type_info</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.5.2</td><td align="left">Class bad_cast</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.5.3</td><td align="left">Class bad_typeid</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.6</td><td align="left">Exception handling</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">18.6.1</td><td align="left">Class exception</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.6.2</td><td align="left">Violation exception-specifications</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.6.3</td><td align="left">Abnormal termination</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.6.4</td><td align="left"><code class="code">uncaught_exception</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.7</td><td align="left">Other runtime support</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"> 15 <span class="emphasis"><em>19</em></span> 16 </td><td colspan="3" align="left"> 17 <span class="emphasis"><em>Diagnostics</em></span> 18 </td></tr><tr><td align="left">19.1</td><td align="left">Exception classes</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">19.2</td><td align="left">Assertions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">19.3</td><td align="left">Error numbers</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"> 19 <span class="emphasis"><em>20</em></span> 20 </td><td colspan="3" align="left"> 21 <span class="emphasis"><em>General utilities</em></span> 22 </td></tr><tr><td align="left">20.1</td><td align="left">Requirements</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.2</td><td align="left">Utility components</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">20.2.1</td><td align="left">Operators</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.2.2</td><td align="left"><code class="code">pair</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.3</td><td align="left">Function objects</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">20.3.1</td><td align="left">Base</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.3.2</td><td align="left">Arithmetic operation</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.3.3</td><td align="left">Comparisons</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.3.4</td><td align="left">Logical operations</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.3.5</td><td align="left">Negators</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.3.6</td><td align="left">Binders</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.3.7</td><td align="left">Adaptors for pointers to functions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.3.8</td><td align="left">Adaptors for pointers to members</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.4</td><td align="left">Memory</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">20.4.1</td><td align="left">The default allocator</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.4.2</td><td align="left">Raw storage iterator</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.4.3</td><td align="left">Temporary buffers</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.4.4</td><td align="left">Specialized algorithms</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.4.4.1</td><td align="left"><code class="code">uninitialized_copy</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.4.4.2</td><td align="left"><code class="code">uninitialized_fill</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.4.4.3</td><td align="left"><code class="code">uninitialized_fill_n</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.4.5</td><td align="left">Class template <code class="code">auto_ptr</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.4.6</td><td align="left">C library</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"> 23 <span class="emphasis"><em>21</em></span> 24 </td><td colspan="3" align="left"> 25 <span class="emphasis"><em>Strings</em></span> 26 </td></tr><tr><td align="left">21.1</td><td align="left">Character traits</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">21.1.1</td><td align="left">Character traits requirements</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">21.1.2</td><td align="left">traits typedef</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">21.1.3</td><td align="left"><code class="code">char_traits</code> specializations</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">21.1.3.1</td><td align="left">struct <code class="code">char_traits<char></code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">21.1.3.2</td><td align="left">struct <code class="code">char_traits<wchar_t></code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">21.2</td><td align="left">String classes</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">21.3</td><td align="left">Class template <code class="code">basic_string</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">21.4</td><td align="left">Null-terminated sequence utilities</td><td align="left">Y</td><td align="left">C library dependency</td></tr><tr><td align="left"> 27 <span class="emphasis"><em>22</em></span> 28 </td><td colspan="3" align="left"> 29 <span class="emphasis"><em>Localization</em></span> 30 </td></tr><tr><td align="left">22.1</td><td align="left">Locales</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">22.1.1</td><td align="left">Class <code class="code">locale</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.1.2</td><td align="left"><code class="code">locale</code> globals</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.1.3</td><td align="left">Convenience interfaces</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">22.1.3.1</td><td align="left">Character classification</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.1.3.2</td><td align="left">Character conversions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.2</td><td align="left">Standard locale categories</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">22.2.1</td><td align="left"><code class="code">ctype</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.2.2</td><td align="left">Numeric</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">22.2.2.1</td><td align="left"><code class="code">num_get</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.2.2.2</td><td align="left"><code class="code">num_put</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.2.3</td><td align="left"><code class="code">num_punct</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.2.4</td><td align="left"><code class="code">collate</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.2.5</td><td align="left">Time</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">22.2.5.1</td><td align="left"><code class="code">time_get</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.2.5.2</td><td align="left"><code class="code">time_get_byname</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.2.5.3</td><td align="left"><code class="code">time_put</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.2.5.3</td><td align="left"><code class="code">time_put_byname</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.2.6</td><td align="left">Monetary</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">22.2.6.1</td><td align="left"><code class="code">money_get</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.2.6.2</td><td align="left"><code class="code">money_put</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.2.6.3</td><td align="left"><code class="code">money_punct</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.2.6.4</td><td align="left"><code class="code">money_punct_byname</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.2.7</td><td align="left"><code class="code">messages</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.2.8</td><td align="left">Program-defined facets</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.3</td><td align="left">C Library Locales</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"> 31 <span class="emphasis"><em>23</em></span> 32 </td><td colspan="3" align="left"> 33 <span class="emphasis"><em>Containers</em></span> 34 </td></tr><tr><td align="left">23.1</td><td align="left">Container requirements</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.2</td><td align="left">Sequence containers</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">23.2.1</td><td align="left">Class template <code class="code">deque</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.2.2</td><td align="left">Class template <code class="code">list</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.2.3</td><td align="left">Adaptors</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">23.2.3.1</td><td align="left">Class template <code class="code">queue</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.2.3.2</td><td align="left">Class template <code class="code">priority_queue</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.2.3.3</td><td align="left">Class template <code class="code">stack</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.2.4</td><td align="left">Class template <code class="code">vector</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.2.5</td><td align="left">Class <code class="code">vector<bool></code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.3</td><td align="left">Associative containers</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">23.3.1</td><td align="left">Class template <code class="code">map</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.3.2</td><td align="left">Class template <code class="code">multimap</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.3.3</td><td align="left">Class template <code class="code">set</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.3.4</td><td align="left">Class template <code class="code">multiset</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"> 35 <span class="emphasis"><em>24</em></span> 36 </td><td colspan="3" align="left"> 37 <span class="emphasis"><em>Iterators</em></span> 38 </td></tr><tr><td align="left">24.1</td><td align="left">Requirements</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">24.2</td><td align="left">Header <code class="code"><iterator></code> synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">24.3</td><td align="left">Iterator primitives</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">24.4</td><td align="left">Predefined iterators and Iterator adaptors</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">24.4.1</td><td align="left">Reverse iterators</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">24.4.2</td><td align="left">Insert iterators</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">24.5</td><td align="left">Stream iterators</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">24.5.1</td><td align="left">Class template <code class="code">istream_iterator</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">24.5.2</td><td align="left">Class template <code class="code">ostream_iterator</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">24.5.3</td><td align="left">Class template <code class="code">istreambuf_iterator</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">24.5.4</td><td align="left">Class template <code class="code">ostreambuf_iterator</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"> 39 <span class="emphasis"><em>25</em></span> 40 </td><td colspan="3" align="left"> 41 <span class="emphasis"><em>Algorithms</em></span> 42 </td></tr><tr><td align="left">25.1</td><td align="left">Non-modifying sequence operations</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">25.2</td><td align="left">Mutating sequence operations</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">25.3</td><td align="left">Sorting and related operations</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">25.4</td><td align="left">C library algorithms</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"> 43 <span class="emphasis"><em>26</em></span> 44 </td><td colspan="3" align="left"> 45 <span class="emphasis"><em>Numerics</em></span> 46 </td></tr><tr><td align="left">26.1</td><td align="left">Numeric type requirements</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.2</td><td align="left">Complex numbers</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.3</td><td align="left">Numeric arrays</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">26.3.1</td><td align="left">Header <code class="code"><valarray></code> synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.3.2</td><td align="left">Class template <code class="code">valarray</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.3.3</td><td align="left"><code class="code">valarray</code> non-member operations</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.3.4</td><td align="left">Class <code class="code">slice</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.3.5</td><td align="left">Class template <code class="code">slice_array</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.3.6</td><td align="left">Class <code class="code">gslice</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.3.7</td><td align="left">Class template <code class="code">gslice_array</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.3.8</td><td align="left">Class template <code class="code">mask_array</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.3.9</td><td align="left">Class template <code class="code">indirect_array</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.4</td><td align="left">Generalized numeric operations</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">26.4.1</td><td align="left"><code class="code">accumulate</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.4.2</td><td align="left"><code class="code">inner_product</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.4.3</td><td align="left"><code class="code">partial_sum</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.4.4</td><td align="left"><code class="code">adjacent_difference</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.4.5</td><td align="left">iota</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.5</td><td align="left">C Library</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"> 47 <span class="emphasis"><em>27</em></span> 48 </td><td colspan="3" align="left"> 49 <span class="emphasis"><em>Input/output</em></span> 50 </td></tr><tr><td align="left">27.1</td><td align="left">Requirements</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">27.2</td><td align="left">Forward declarations</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">27.3</td><td align="left">Standard iostream objects</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">27.3.1</td><td align="left">Narrow stream objects</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">27.3.2</td><td align="left">Wide stream objects</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">27.4</td><td align="left">Iostreams base classes</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">27.5</td><td align="left">Stream buffers</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">27.6</td><td align="left">Formatting and manipulators</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">27.7</td><td align="left">String-based streams</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">27.8</td><td align="left">File-based streams</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"> 51 <span class="emphasis"><em>Appendix D</em></span> 52 </td><td colspan="3" align="left"> 53 <span class="emphasis"><em>Compatibility features</em></span> 54 </td></tr><tr><td align="left">D.1</td><td align="left">Increment operator with bool operand</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">D.2</td><td align="left"><code class="code">static</code> keyword</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">D.3</td><td align="left">Access declarations</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">D.4</td><td align="left">Implicit conversion from const strings</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">D.5</td><td align="left">C standard library headers</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">D.6</td><td align="left">Old iostreams members</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">D.7</td><td align="left">char* streams</td><td align="left"></td><td align="left"></td></tr></tbody></table></div></div><br class="table-break" /></div><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="iso.1998.specific"></a>Implementation Specific Behavior</h4></div></div></div><p> 55 The ISO standard defines the following phrase: 56 </p><div class="blockquote"><blockquote class="blockquote"><div class="variablelist"><dl class="variablelist"><dt><span class="term"> 57 <code class="code">[1.3.5] implementation-defined behavior</code> 58 </span></dt><dd><p> 59 Behavior, for a well-formed program construct and correct data, that 60 depends on the implementation <span class="emphasis"><em>and that each implementation 61 shall document</em></span>. 62 </p></dd></dl></div></blockquote></div><p> 63 We do so here, for the C++ library only. Behavior of the 64 compiler, linker, runtime loader, and other elements of "the 65 implementation" are documented elsewhere. Everything listed 66 in Annex B, Implementation Qualities, are also part of the 67 compiler, not the library. 68 </p><p> 69 For each entry, we give the section number of the standard, when 70 applicable. This list is probably incomplet and inkorrekt. 71 </p><p> 72 <span class="emphasis"><em>[1.9]/11 #3</em></span> If <code class="code">isatty(3)</code> is true, then 73 interactive stream support is implied. 74 </p><p> 75 <span class="emphasis"><em>[17.4.4.5]</em></span> Non-reentrant functions are probably best 76 discussed in the various sections on multithreading (see above). 77 </p><p><span class="emphasis"><em>[18.1]/4</em></span> The type of <code class="code">NULL</code> is described 78 under <a class="link" href="support.html#std.support.types.null" title="NULL">Support</a>. 79 </p><p><span class="emphasis"><em>[18.3]/8</em></span> Even though it's listed in the library 80 sections, libstdc++ has zero control over what the cleanup code hands 81 back to the runtime loader. Talk to the compiler people. :-) 82 </p><p><span class="emphasis"><em>[18.4.2.1]/5</em></span> (bad_alloc), 83 <span class="emphasis"><em>[18.5.2]/5</em></span> (bad_cast), 84 <span class="emphasis"><em>[18.5.3]/5</em></span> (bad_typeid), 85 <span class="emphasis"><em>[18.6.1]/8</em></span> (exception), 86 <span class="emphasis"><em>[18.6.2.1]/5</em></span> (bad_exception): The <code class="code">what()</code> 87 member function of class <code class="code">std::exception</code>, and these other 88 classes publicly derived from it, returns the name of the 89 class, e.g. <code class="literal">"std::bad_alloc"</code>. 90 </p><p><span class="emphasis"><em>[18.5.1]/7</em></span> The return value of 91 <code class="code">std::type_info::name()</code> is the mangled type name. 92 You will need to call <code class="code">c++filt</code> and pass the names as 93 command-line parameters to demangle them, or call a 94 <a class="link" href="ext_demangling.html" title="Chapter28.Demangling">runtime demangler function</a>. 95 </p><p><span class="emphasis"><em>[20.1.5]/5</em></span> <span class="emphasis"><em>"Implementors are encouraged to 96 supply libraries that can accept allocators that encapsulate more 97 general memory models and that support non-equal instances. In such 98 implementations, any requirements imposed on allocators by containers 99 beyond those requirements that appear in Table 32, and the semantics 100 of containers and algorithms when allocator instances compare 101 non-equal, are implementation-defined."</em></span> There is experimental 102 support for non-equal allocators in the standard containers in C++98 103 mode. There are no additional requirements on allocators. It is undefined 104 behaviour to swap two containers if their allocators are not equal. 105 </p><p><span class="emphasis"><em>[21.1.3.1]/3,4</em></span>, 106 <span class="emphasis"><em>[21.1.3.2]/2</em></span>, 107 <span class="emphasis"><em>[21.3]/6 basic_string::iterator, basic_string::const_iterator</em></span>, 108 <span class="emphasis"><em>[23.*]'s foo::iterator</em></span>, 109 <span class="emphasis"><em>[27.*]'s foo::*_type</em></span>, 110 <span class="emphasis"><em>others...</em></span> 111 Nope, these types are called implementation-defined because you 112 shouldn't be taking advantage of their underlying types. Listing them 113 here would defeat the purpose. :-) 114 </p><p><span class="emphasis"><em>[21.1.3.1]/5</em></span> I don't really know about 115 the <span class="type">mbstate_t</span> stuff... see 116 the <a class="link" href="facets.html#std.localization.facet.codecvt" title="codecvt"><code class="code">codecvt</code> 117 notes</a> for what does exist. 118 </p><p><span class="emphasis"><em>[22.*]</em></span> Anything and everything we have on locale 119 implementation will be described under 120 <a class="link" href="localization.html#std.localization.locales.locale" title="locale">Localization</a>. 121 </p><p><span class="emphasis"><em>[23.*]</em></span> All of the containers in this clause 122 define <span class="type">size_type</span> as <span class="type">std::size_t</span> and 123 <span class="type">difference_type</span> as <span class="type">std::ptrdiff_t</span>. 124 </p><p><span class="emphasis"><em>[26.2.8]/9</em></span> I have no idea what 125 <code class="code">complex<T></code>'s <code class="code">pow(0,0)</code> returns. 126 </p><p><span class="emphasis"><em>[27.4.2.4]/2</em></span> Calling 127 <code class="code">std::ios_base::sync_with_stdio</code> after I/O has already been 128 performed on the standard stream objects will 129 flush the buffers, and 130 destroy and recreate the underlying buffer instances. Whether or not 131 the previously-written I/O is destroyed in this process depends mostly 132 on the <code class="code">--enable-libio</code> choice: for stdio, if the written 133 data is already in the stdio buffer, the data may be completely safe! 134 </p><p><span class="emphasis"><em>[27.6.1.1.2]</em></span>, 135 <span class="emphasis"><em>[27.6.2.3]</em></span> The I/O sentry ctor and dtor can perform 136 additional work than the minimum required. We are not currently taking 137 advantage of this yet. 138 </p><p><span class="emphasis"><em>[27.7.1.3]/16</em></span>, 139 <span class="emphasis"><em>[27.8.1.4]/10</em></span> 140 The effects of <code class="code">pubsetbuf/setbuf</code> are described in the 141 <a class="link" href="io.html" title="Chapter13. Input and Output">Input and Output</a> chapter. 142 </p><p><span class="emphasis"><em>[27.8.1.4]/16</em></span> Calling <code class="code">fstream::sync</code> when 143 a get area exists will... whatever <code class="code">fflush()</code> does, I think. 144 </p></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="status.iso.2011"></a>C++ 2011</h3></div></div></div><p> 145 <a id="status.iso.200x"></a> 146 This table is based on the table of contents of ISO/IEC 147 JTC1 SC22 WG21 Doc No: N3290 Date: 2011-04-11 148 Final Draft International Standard, Standard for Programming Language C++ 149 </p><p> 150 In this implementation the <code class="literal">-std=gnu++11</code> or 151 <code class="literal">-std=c++11</code> flag must be used to enable language 152 and library 153 features. See <a class="link" href="using.html#manual.intro.using.flags" title="Command Options">dialect</a> 154 options. The pre-defined symbol 155 <code class="constant">__cplusplus</code> is used to check for the 156 presence of the required flag. 157 GCC 5.1 was the first release with non-experimental C++11 support, 158 so the API and ABI of features added in C++11 is only stable 159 since that release. 160 </p><p> 161 This status table is based on the table of contents of ISO/IEC 14882:2011. 162 </p><p> 163 This section describes the C++11 support in 164 the GCC 14 release series. 165 </p><div class="table"><a id="table.cxx11_status"></a><p class="title"><strong>Table1.2.C++ 2011 Implementation Status</strong></p><div class="table-contents"><table class="table" summary="C++ 2011 Implementation Status" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /></colgroup><thead><tr><th align="left">Section</th><th align="left">Description</th><th align="left">Status</th><th align="left">Comments</th></tr></thead><tbody><tr><td align="left"> 166 <span class="emphasis"><em>18</em></span> 167 </td><td colspan="3" align="left"> 168 <span class="emphasis"><em>Language support</em></span> 169 </td></tr><tr><td align="left">18.1</td><td align="left">General</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">18.2</td><td align="left">Types</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.3</td><td align="left">Implementation properties</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">18.3.2</td><td align="left">Numeric Limits</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">18.3.2.3</td><td align="left">Class template <code class="code">numeric_limits</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.3.2.4</td><td align="left"><code class="code">numeric_limits</code> members</td><td align="left">Y</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">18.3.2.5</td><td align="left"><code class="code">float_round_style</code></td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">18.3.2.6</td><td align="left"><code class="code">float_denorm_style</code></td><td align="left">N</td><td align="left"></td></tr><tr><td align="left">18.3.2.7</td><td align="left"><code class="code">numeric_limits</code> specializations</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.3.3</td><td align="left">C Library</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.4</td><td align="left">Integer types</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">18.4.1</td><td align="left">Header <code class="code"><cstdint></code> synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr bgcolor="#B0B0B0"><td align="left">18.5</td><td align="left">Start and termination</td><td align="left">Partial</td><td align="left">C library dependency for quick_exit, at_quick_exit</td></tr><tr><td align="left">18.6</td><td align="left">Dynamic memory management</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.7</td><td align="left">Type identification</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">18.7.1</td><td align="left">Class type_info</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.7.2</td><td align="left">Class bad_cast</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.7.3</td><td align="left">Class bad_typeid</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.8</td><td align="left">Exception handling</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">18.8.1</td><td align="left">Class exception</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.8.2</td><td align="left">Class bad_exception</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.8.3</td><td align="left">Abnormal termination</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.8.4</td><td align="left"><code class="code">uncaught_exception</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.8.5</td><td align="left">Exception Propagation</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.8.6</td><td align="left"><code class="code">nested_exception</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.9</td><td align="left">Initializer lists</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">18.9.1</td><td align="left">Initializer list constructors</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.9.2</td><td align="left">Initializer list access</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.9.3</td><td align="left">Initializer list range access</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.10</td><td align="left">Other runtime support</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"> 170 <span class="emphasis"><em>19</em></span> 171 </td><td colspan="3" align="left"> 172 <span class="emphasis"><em>Diagnostics</em></span> 173 </td></tr><tr><td align="left">19.1</td><td align="left">General</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">19.2</td><td align="left">Exception classes</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">19.3</td><td align="left">Assertions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">19.4</td><td align="left">Error numbers</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">19.5</td><td align="left">System error support</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">19.5.1</td><td align="left">Class <code class="code">error_category</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">19.5.2</td><td align="left">Class <code class="code">error_code</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">19.5.3</td><td align="left">Class <code class="code">error_condition</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">19.5.4</td><td align="left">Comparison operators</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">19.5.5</td><td align="left">Class <code class="code">system_error</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"> 174 <span class="emphasis"><em>20</em></span> 175 </td><td colspan="3" align="left"> 176 <span class="emphasis"><em>General utilities</em></span> 177 </td></tr><tr><td align="left">20.1</td><td align="left">General</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">20.2</td><td align="left">Utility components</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">20.2.1</td><td align="left">Operators</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.2.2</td><td align="left">swap</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.2.3</td><td align="left">forward/move helpers</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.2.4</td><td align="left">Function template <code class="code">declval</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.3</td><td align="left">Pairs</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">20.3.1</td><td align="left">In general</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">20.3.2</td><td align="left">Class template <code class="code">pair</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.3.3</td><td align="left">Specialized algorithms</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.3.4</td><td align="left">Tuple-like access to <code class="code">pair</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.3.5</td><td align="left">Piecewise construction</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.4</td><td align="left">Tuples</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">20.4.1</td><td align="left">In general</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">20.4.2</td><td align="left">Class template <code class="code">tuple</code></td><td align="left"></td><td align="left"></td></tr><tr><td align="left">20.4.2.1</td><td align="left">Construction</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.4.2.2</td><td align="left">Assignment</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.4.2.3</td><td align="left">Swap</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.4.2.4</td><td align="left">Tuple creation functions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.4.2.5</td><td align="left">Tuple helper classes</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.4.2.6</td><td align="left">Element access</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.4.2.7</td><td align="left">Relational operators</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.4.2.8</td><td align="left">Tuple traits</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.4.2.9</td><td align="left">Tuple specialized algorithms</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.5</td><td align="left">Class template <code class="code">bitset</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.5.1</td><td align="left"><code class="code">bitset</code> constructors</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.5.2</td><td align="left"><code class="code">bitset</code> members</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.5.3</td><td align="left"><code class="code">bitset</code> hash support</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.5.4</td><td align="left"><code class="code">bitset</code> operators</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.6</td><td align="left">Memory</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">20.6.1</td><td align="left">In general</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">20.6.2</td><td align="left">Header <code class="code"><memory></code> synopsis</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">20.6.3</td><td align="left">Pointer traits</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.6.4</td><td align="left">Pointer safety</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.6.5</td><td align="left">Align</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.6.6</td><td align="left">Allocator argument tag</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.6.7</td><td align="left"><code class="code">uses_allocator</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.6.8</td><td align="left">Allocator traits</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.6.9</td><td align="left">The default allocator</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.6.10</td><td align="left">Raw storage iterator</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.6.11</td><td align="left">Temporary buffers</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.6.12</td><td align="left">Specialized algorithms</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">20.6.12.1</td><td align="left"><code class="code">addressof</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.6.12.2</td><td align="left"><code class="code">uninitialized_copy</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.6.12.3</td><td align="left"><code class="code">uninitialized_fill</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.6.12.4</td><td align="left"><code class="code">uninitialized_fill_n</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.6.13</td><td align="left">C library</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.7</td><td align="left">Smart pointers</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">20.7.1</td><td align="left">Class template <code class="code">unique_ptr</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.7.2</td><td align="left">Shared-ownership pointers</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">20.7.2.1</td><td align="left">Class <code class="code">bad_weak_ptr</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.7.2.2</td><td align="left">Class template <code class="code">shared_ptr</code></td><td align="left">Y</td><td align="left"> 178 Uses code from 179 <a class="link" href="http://www.boost.org/libs/smart_ptr/shared_ptr.htm" target="_top">boost::shared_ptr</a>. 180 </td></tr><tr><td align="left">20.7.2.3</td><td align="left">Class template <code class="code">weak_ptr</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.7.2.4</td><td align="left">Class template <code class="code">enable_shared_from_this</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.7.2.5</td><td align="left"><code class="code">shared_ptr</code> atomic access</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.7.2.6</td><td align="left">Smart pointer hash support</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.8</td><td align="left">Function objects</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">20.8.1</td><td align="left">Definitions</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">20.8.2</td><td align="left">Requirements</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">20.8.3</td><td align="left">Class template <code class="code">reference_wrapper</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.8.4</td><td align="left">Arithmetic operation</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.8.5</td><td align="left">Comparisons</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.8.6</td><td align="left">Logical operations</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.8.7</td><td align="left">Bitwise operations</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.8.8</td><td align="left">Negators</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.8.9</td><td align="left">Function template <code class="code">bind</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.8.10</td><td align="left">Function template <code class="code">mem_fn</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.8.11</td><td align="left">Polymorphic function wrappers</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">20.8.11.1</td><td align="left">Class <code class="code">bad_function_call</code></td><td align="left">Y</td><td align="left"></td></tr><tr bgcolor="#B0B0B0"><td align="left">20.8.11.2</td><td align="left">Class template <code class="code">function</code></td><td align="left">Partial</td><td align="left">Missing allocator support</td></tr><tr><td align="left">20.8.12</td><td align="left">Class template <code class="code">hash</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.9</td><td align="left">Metaprogramming and type traits</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">20.9.1</td><td align="left">Requirements</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.9.2</td><td align="left">Header <code class="code"><type_traits></code> synopsis</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">20.9.3</td><td align="left">Helper classes</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.9.4</td><td align="left">Unary Type Traits</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.9.4.1</td><td align="left">Primary type categories</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.9.4.2</td><td align="left">Composite type traits</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.9.4.3</td><td align="left">Type properties</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.9.5</td><td align="left">Type property queries</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.9.6</td><td align="left">Relationships between types</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.9.7</td><td align="left">Transformations between types</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">20.9.7.1</td><td align="left">Const-volatile modifications</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.9.7.2</td><td align="left">Reference modifications</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.9.7.3</td><td align="left">Sign modifications</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.9.7.4</td><td align="left">Array modifications</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.9.7.5</td><td align="left">Pointer modifications</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.9.7.6</td><td align="left">Other transformations</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.10</td><td align="left">Compile-time rational arithmetic</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">20.10.1</td><td align="left">In general</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">20.10.2</td><td align="left">Header <code class="code"><ratio></code> synopsis</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">20.10.3</td><td align="left">Class template <code class="code">ratio</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.10.4</td><td align="left">Arithmetic on <code class="code">ratio</code>s</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.10.5</td><td align="left">Comparison of <code class="code">ratio</code>s</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.10.6</td><td align="left">SI types for <code class="code">ratio</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.11</td><td align="left">Time utilities</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">20.11.3</td><td align="left">Clock requirements</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.11.4</td><td align="left">Time-related traits</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">20.11.4.1</td><td align="left"><code class="code">treat_as_floating_point</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.11.4.2</td><td align="left"><code class="code">duration_values</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.11.4.3</td><td align="left">Specializations of <code class="code">common_type</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.11.5</td><td align="left">Class template <code class="code">duration</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.11.6</td><td align="left">Class template <code class="code">time_point</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.11.7</td><td align="left">Clocks</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">20.11.7.1</td><td align="left">Class <code class="code">system_clock</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.11.7.2</td><td align="left">Class <code class="code">steady_clock</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.11.7.3</td><td align="left">Class <code class="code">high_resolution_clock</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.11.8</td><td align="left">Date and time functions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.12</td><td align="left">Scoped allocator adaptor</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.12.1</td><td align="left">Header <code class="code"><scoped_allocator></code> synopsis</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">20.12.2</td><td align="left">Scoped allocator adaptor member types</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.12.3</td><td align="left">Scoped allocator adaptor constructors</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.12.4</td><td align="left">Scoped allocator adaptor members</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.12.5</td><td align="left">Scoped allocator operators</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.13</td><td align="left">Class <code class="code">type_index</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"> 181 <span class="emphasis"><em>21</em></span> 182 </td><td colspan="3" align="left"> 183 <span class="emphasis"><em>Strings</em></span> 184 </td></tr><tr><td align="left">21.1</td><td align="left">General</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">21.2</td><td align="left">Character traits</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">21.2.1</td><td align="left">Character traits requirements</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">21.2.2</td><td align="left">traits typedefs</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">21.2.3</td><td align="left"><code class="code">char_traits</code> specializations</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">21.2.3.1</td><td align="left">struct <code class="code">char_traits<char></code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">21.2.3.2</td><td align="left">struct <code class="code">char_traits<char16_t></code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">21.2.3.3</td><td align="left">struct <code class="code">char_traits<char32_t></code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">21.2.3.4</td><td align="left">struct <code class="code">char_traits<wchar_t></code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">21.3</td><td align="left">String classes</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">21.4</td><td align="left">Class template <code class="code">basic_string</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">21.5</td><td align="left">Numeric Conversions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">21.6</td><td align="left">Hash support</td><td align="left">Y</td><td align="left"></td></tr><tr bgcolor="#B0B0B0"><td align="left">21.7</td><td align="left">Null-terminated sequence utilities</td><td align="left">Partial</td><td align="left">C library dependency. </td></tr><tr><td align="left"> 185 <span class="emphasis"><em>22</em></span> 186 </td><td colspan="3" align="left"> 187 <span class="emphasis"><em>Localization</em></span> 188 </td></tr><tr><td align="left">22.1</td><td align="left">General</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.2</td><td align="left">Header <code class="code"><locale></code> synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.3</td><td align="left">Locales</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">22.3.1</td><td align="left">Class <code class="code">locale</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.3.2</td><td align="left"><code class="code">locale</code> globals</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.3.3</td><td align="left">Convenience interfaces</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">22.3.3.1</td><td align="left">Character classification</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.3.3.2</td><td align="left">Conversions</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">22.3.3.2.1</td><td align="left">Character conversions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.3.3.2.2</td><td align="left"><code class="code">string</code> conversions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.3.3.2.3</td><td align="left">Buffer conversions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.4</td><td align="left">Standard <code class="code">locale</code> categories</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">22.4.1</td><td align="left">The <code class="code">ctype</code> category</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.4.2</td><td align="left">The numeric category</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">22.4.2.1</td><td align="left"><code class="code">num_get</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.4.2.2</td><td align="left"><code class="code">num_put</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.4.3</td><td align="left">The numeric punctuation facet</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.4.4</td><td align="left">The collate category</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.4.5</td><td align="left">The time category</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">22.4.5.1</td><td align="left">Class template <code class="code">time_get</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.4.5.2</td><td align="left">Class template <code class="code">time_get_byname</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.4.5.3</td><td align="left">Class template <code class="code">time_put</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.4.5.3</td><td align="left">Class template <code class="code">time_put_byname</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.4.6</td><td align="left">The monetary category</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">22.4.6.1</td><td align="left">Class template <code class="code">money_get</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.4.6.2</td><td align="left">Class template <code class="code">money_put</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.4.6.3</td><td align="left">Class template <code class="code">money_punct</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.4.6.4</td><td align="left">Class template <code class="code">money_punct_byname</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.4.7</td><td align="left">The message retrieval category</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.4.8</td><td align="left">Program-defined facets</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.5</td><td align="left">Standard code conversion facets</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.6</td><td align="left">C Library Locales</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"> 189 <span class="emphasis"><em>23</em></span> 190 </td><td colspan="3" align="left"> 191 <span class="emphasis"><em>Containers</em></span> 192 </td></tr><tr><td align="left">23.1</td><td align="left">General</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">23.2</td><td align="left">Container requirements</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">23.2.1</td><td align="left">General container requirements</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.2.2</td><td align="left">Container data races</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.2.3</td><td align="left">Sequence containers</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.2.4</td><td align="left">Associative containers</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.2.5</td><td align="left">Unordered associative containers</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.3</td><td align="left">Sequence containers</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">23.3.2</td><td align="left">Class template <code class="code">array</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.3.3</td><td align="left">Class template <code class="code">deque</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.3.4</td><td align="left">Class template <code class="code">forward_list</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.3.5</td><td align="left">Class template <code class="code">list</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.3.6</td><td align="left">Class template <code class="code">vector</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.3.7</td><td align="left">Class <code class="code">vector<bool></code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.4</td><td align="left">Associative containers</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">23.4.4</td><td align="left">Class template <code class="code">map</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.4.5</td><td align="left">Class template <code class="code">multimap</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.4.6</td><td align="left">Class template <code class="code">set</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.4.7</td><td align="left">Class template <code class="code">multiset</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.5</td><td align="left">Unordered associative containers</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">23.5.4</td><td align="left">Class template <code class="code">unordered_map</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.5.5</td><td align="left">Class template <code class="code">unordered_multimap</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.5.6</td><td align="left">Class template <code class="code">unordered_set</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.5.7</td><td align="left">Class template <code class="code">unordered_multiset</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.6</td><td align="left">Container adaptors</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">23.6.1</td><td align="left">Class template <code class="code">queue</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.6.2</td><td align="left">Class template <code class="code">priority_queue</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.6.3</td><td align="left">Class template <code class="code">stack</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"> 193 <span class="emphasis"><em>24</em></span> 194 </td><td colspan="3" align="left"> 195 <span class="emphasis"><em>Iterators</em></span> 196 </td></tr><tr><td align="left">24.1</td><td align="left">General</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">24.2</td><td align="left">Iterator requirements</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">24.3</td><td align="left">Header <code class="code"><iterator></code> synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">24.4</td><td align="left">Iterator primitives</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">24.5</td><td align="left">Iterator adaptors</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">24.5.1</td><td align="left">Reverse iterators</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">24.5.2</td><td align="left">Insert iterators</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">24.5.3</td><td align="left">Move iterators</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">24.6</td><td align="left">Stream iterators</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">24.6.1</td><td align="left">Class template <code class="code">istream_iterator</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">24.6.2</td><td align="left">Class template <code class="code">ostream_iterator</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">24.6.3</td><td align="left">Class template <code class="code">istreambuf_iterator</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">24.6.4</td><td align="left">Class template <code class="code">ostreambuf_iterator</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">24.6.5</td><td align="left">range access</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"> 197 <span class="emphasis"><em>25</em></span> 198 </td><td colspan="3" align="left"> 199 <span class="emphasis"><em>Algorithms</em></span> 200 </td></tr><tr><td align="left">25.1</td><td align="left">General</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">25.2</td><td align="left">Non-modifying sequence operations</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">25.3</td><td align="left">Mutating sequence operations</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">25.4</td><td align="left">Sorting and related operations</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">25.5</td><td align="left">C library algorithms</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"> 201 <span class="emphasis"><em>26</em></span> 202 </td><td colspan="3" align="left"> 203 <span class="emphasis"><em>Numerics</em></span> 204 </td></tr><tr><td align="left">26.1</td><td align="left">General</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">26.2</td><td align="left">Numeric type requirements</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.3</td><td align="left">The floating-point environment</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.4</td><td align="left">Complex numbers</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.5</td><td align="left">Random number generation</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">26.5.1</td><td align="left">Requirements</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">26.5.2</td><td align="left">Header <code class="code"><random></code> synopsis</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">26.5.3</td><td align="left">Random number engine class templates</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">26.5.3.1</td><td align="left">Class template <code class="code">linear_congruential_engine</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.5.3.2</td><td align="left">Class template <code class="code">mersenne_twister_engine</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.5.3.3</td><td align="left">Class template <code class="code">subtract_with_carry_engine</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.5.4</td><td align="left">Random number engine adaptor class templates</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">26.5.4.2</td><td align="left">Class template <code class="code">discard_block_engine</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.5.4.3</td><td align="left">Class template <code class="code">independent_bits_engine</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.5.4.4</td><td align="left">Class template <code class="code">shuffle_order_engine</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.5.5</td><td align="left">Engines and engine adaptors with predefined parameters</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.5.6</td><td align="left">Class <code class="code">random_device</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.5.7</td><td align="left">Utilities</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">26.5.7.1</td><td align="left">Class <code class="code">seed_seq</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.5.7.2</td><td align="left">Function template <code class="code">generate_canonical</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.5.8</td><td align="left">Random number distribution class templates</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">26.5.8.2</td><td align="left">Uniform distributions</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">26.5.8.2.1</td><td align="left">Class template <code class="code">uniform_int_distribution</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.5.8.2.2</td><td align="left">Class template <code class="code">uniform_real_distribution</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.5.8.3</td><td align="left">Bernoulli distributions</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">26.5.8.3.1</td><td align="left">Class <code class="code">bernoulli_distribution</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.5.8.3.2</td><td align="left">Class template <code class="code">binomial_distribution</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.5.8.3.3</td><td align="left">Class template <code class="code">geometric_distribution</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.5.8.3.4</td><td align="left">Class template <code class="code">negative_binomial_distribution</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.5.8.4</td><td align="left">Poisson distributions</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">26.5.8.4.1</td><td align="left">Class template <code class="code">poisson_distribution</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.5.8.4.2</td><td align="left">Class template <code class="code">exponential_distribution</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.5.8.4.3</td><td align="left">Class template <code class="code">gamma_distribution</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.5.8.4.4</td><td align="left">Class template <code class="code">weibull_distribution</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.5.8.4.5</td><td align="left">Class template <code class="code">extreme_value_distribution</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.5.8.5</td><td align="left">Normal distributions</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">26.5.8.5.1</td><td align="left">Class template <code class="code">normal_distribution</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.5.8.5.2</td><td align="left">Class template <code class="code">lognormal_distribution</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.5.8.5.3</td><td align="left">Class template <code class="code">chi_squared_distribution</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.5.8.5.4</td><td align="left">Class template <code class="code">cauchy_distribution</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.5.8.5.5</td><td align="left">Class template <code class="code">fisher_f_distribution</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.5.8.5.6</td><td align="left">Class template <code class="code">student_t_distribution</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.5.8.6</td><td align="left">Sampling distributions</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">26.5.8.6.1</td><td align="left">Class template <code class="code">discrete_distribution</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.5.8.6.2</td><td align="left">Class template <code class="code">piecewise_constant_distribution</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.5.8.6.3</td><td align="left">Class template <code class="code">piecewise_linear_distribution</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.6</td><td align="left">Numeric arrays</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">26.6.1</td><td align="left">Header <code class="code"><valarray></code> synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.6.2</td><td align="left">Class template <code class="code">valarray</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.6.3</td><td align="left"><code class="code">valarray</code> non-member operations</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.6.4</td><td align="left">Class <code class="code">slice</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.6.5</td><td align="left">Class template <code class="code">slice_array</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.6.6</td><td align="left">The <code class="code">gslice</code> class</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.6.7</td><td align="left">Class template <code class="code">gslice_array</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.6.8</td><td align="left">Class template <code class="code">mask_array</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.6.9</td><td align="left">Class template <code class="code">indirect_array</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.6.10</td><td align="left"><code class="code">valarray</code> range access</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.7</td><td align="left">Generalized numeric operations</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">26.7.1</td><td align="left">Header <code class="code"><numeric></code> synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.7.2</td><td align="left">Accumulate></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.7.3</td><td align="left">Inner product</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.7.4</td><td align="left">Partial sum</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.7.5</td><td align="left">Adjacent difference</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.7.6</td><td align="left">Iota</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.8</td><td align="left">C Library</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"> 205 <span class="emphasis"><em>27</em></span> 206 </td><td colspan="3" align="left"> 207 <span class="emphasis"><em>Input/output library</em></span> 208 </td></tr><tr><td align="left">27.1</td><td align="left">General</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">27.2</td><td align="left">Iostreams requirements</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">27.2.1</td><td align="left">Imbue Limitations</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">27.2.2</td><td align="left">Positioning Type Limitations</td><td align="left">Y</td><td align="left"></td></tr><tr bgcolor="#B0B0B0"><td align="left">27.2.3</td><td align="left">Thread safety</td><td align="left">Partial</td><td align="left"></td></tr><tr><td align="left">27.3</td><td align="left">Forward declarations</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">27.4</td><td align="left">Standard iostream objects</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">27.4.1</td><td align="left">Overview</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">27.4.2</td><td align="left">Narrow stream objects</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">27.4.3</td><td align="left">Wide stream objects</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">27.5</td><td align="left">Iostreams base classes</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">27.6</td><td align="left">Stream buffers</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">27.7</td><td align="left">Formatting and manipulators</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">27.8</td><td align="left">String-based streams</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">27.9</td><td align="left">File-based streams</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"> 209 <span class="emphasis"><em>28</em></span> 210 </td><td colspan="3" align="left"> 211 <span class="emphasis"><em>Regular expressions</em></span> 212 </td></tr><tr><td align="left">28.1</td><td align="left">General</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">28.2</td><td align="left">Definitions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">28.3</td><td align="left">Requirements</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">28.4</td><td align="left">Header <code class="code"><regex></code> synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">28.5</td><td align="left">Namespace <code class="code">std::regex_constants</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">28.6</td><td align="left">Class <code class="code">regex_error</code></td><td align="left">Y</td><td align="left"></td></tr><tr bgcolor="#B0B0B0"><td align="left">28.7</td><td align="left">Class template <code class="code">regex_traits</code></td><td align="left">Partial</td><td align="left"><code class="code">transform_primary</code> is not correctly implemented</td></tr><tr><td align="left">28.8</td><td align="left">Class template <code class="code">basic_regex</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">28.9</td><td align="left">Class template <code class="code">sub_match</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">28.10</td><td align="left">Class template <code class="code">match_results</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">28.11</td><td align="left">Regular expression algorithms</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">28.12</td><td align="left">Regular expression Iterators</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">28.13</td><td align="left">Modified ECMAScript regular expression grammar</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"> 213 <span class="emphasis"><em>29</em></span> 214 </td><td colspan="3" align="left"> 215 <span class="emphasis"><em>Atomic operations</em></span> 216 </td></tr><tr><td align="left">29.1</td><td align="left">General</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">29.2</td><td align="left">Header <code class="code"><atomic></code> synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">29.3</td><td align="left">Order and consistency</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">29.4</td><td align="left">Lock-free property</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">29.5</td><td align="left">Atomic types</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">29.6</td><td align="left">Operations on atomic types</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">29.7</td><td align="left">Flag Type and operations</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">29.8</td><td align="left">Fences</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"> 217 <span class="emphasis"><em>30</em></span> 218 </td><td colspan="3" align="left"> 219 <span class="emphasis"><em>Thread support</em></span> 220 </td></tr><tr><td align="left">30.1</td><td align="left">General</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.2</td><td align="left">Requirements</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.3</td><td align="left">Threads</td><td align="left"></td><td align="left"></td></tr><tr bgcolor="#B0B0B0"><td align="left">30.3.1</td><td align="left">Class <code class="code">thread</code></td><td align="left">Partial</td><td align="left"><code class="code">thread::id</code> comparisons not well-defined</td></tr><tr><td align="left">30.3.2</td><td align="left">Namespace <code class="code">this_thread</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.4</td><td align="left">Mutual exclusion</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">30.4.1</td><td align="left">Mutex requirements</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">30.4.1.1</td><td align="left">In general</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">30.4.1.2</td><td align="left">Mutex types</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">30.4.1.2.1</td><td align="left">Class <code class="code">mutex</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.4.1.2.2</td><td align="left">Class <code class="code">recursive_mutex</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.4.1.3</td><td align="left">Timed mutex types</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">30.4.1.3.1</td><td align="left">Class <code class="code">timed_mutex</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.4.1.3.2</td><td align="left">Class <code class="code">recursive_timed_mutex</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.4.2</td><td align="left">Locks</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">30.4.2.1</td><td align="left">Class template <code class="code">lock_guard</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.4.2.2</td><td align="left">Class template <code class="code">unique_lock</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.4.3</td><td align="left">Generic locking algorithms</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.4.4</td><td align="left">Call once</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">30.4.4.1</td><td align="left">Struct <code class="code">once_flag</code></td><td align="left">Y</td><td align="left"></td></tr><tr bgcolor="#B0B0B0"><td align="left">30.4.4.2</td><td align="left">Function <code class="code">call_once</code></td><td align="left">Y</td><td align="left">Exception support is broken. 221 See <a class="link" href="https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66146" target="_top">PR 222 66146</a>. 223 </td></tr><tr><td align="left">30.5</td><td align="left">Condition variables</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.5.1</td><td align="left">Class <code class="code">condition_variable</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.5.2</td><td align="left">Class <code class="code">condition_variable_any</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.6</td><td align="left">Futures</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">30.6.1</td><td align="left">Overview</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">30.6.2</td><td align="left">Error handling</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.6.3</td><td align="left">Class <code class="code">future_error</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.6.4</td><td align="left">Shared state</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.6.5</td><td align="left">Class template <code class="code">promise</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.6.6</td><td align="left">Class template <code class="code">future</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.6.7</td><td align="left">Class template <code class="code">shared_future</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.6.8</td><td align="left">Function template <code class="code">async</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.6.9</td><td align="left">Class template <code class="code">packaged_task</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"> 224 <span class="emphasis"><em>Appendix D</em></span> 225 </td><td colspan="3" align="left"> 226 <span class="emphasis"><em>Compatibility features</em></span> 227 </td></tr><tr><td align="left">D.1</td><td align="left">Increment operator with <code class="code">bool</code> operand</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">D.2</td><td align="left"><code class="code">register</code> keyword</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">D.3</td><td align="left">Implicit declaration of copy functions</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">D.4</td><td align="left">Dynamic exception specifications</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">D.5</td><td align="left">C standard library headers</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">D.6</td><td align="left">Old iostreams members</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">D.7</td><td align="left"><code class="code">char*</code> streams</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">D.8</td><td align="left">Function objects</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">D.9</td><td align="left">Binders</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">D.10</td><td align="left"><code class="code">auto_ptr</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">D.11</td><td align="left">Violating exception-specifications</td><td align="left">Y</td><td align="left"></td></tr></tbody></table></div></div><br class="table-break" /><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="iso.2011.specific"></a>Implementation Specific Behavior</h4></div></div></div><p>For behaviour which is also specified by the 1998 and 2003 standards, 228 see <a class="link" href="status.html#iso.1998.specific" title="Implementation Specific Behavior">C++ 1998/2003 Implementation 229 Specific Behavior</a>. This section only documents behaviour which 230 is new in the 2011 standard. 231 </p><p> 232 <span class="emphasis"><em>17.6.5.12 [res.on.exception.handling]</em></span> 233 There are no implementation-defined exception classes, only standard 234 exception classes (or classes derived from them) will be thrown. 235 </p><p> 236 <span class="emphasis"><em>17.6.5.14 [value.error.codes]</em></span> 237 The <code class="classname">error_category</code> for errors originating outside 238 the OS, and the possible error code values for each error category, 239 should be documented here. 240 </p><p> 241 <span class="emphasis"><em>18.6.2.2 [new.badlength]</em></span> 242 <code class="function">what()</code> returns 243 <code class="literal">"std::bad_array_new_length"</code>. 244 </p><p> 245 <span class="emphasis"><em>20.6.9.1 [allocator.member]/5</em></span> 246 Over-aligned types are not supported by 247 <code class="classname">std::allocator</code>. 248 </p><p> 249 <span class="emphasis"><em>20.7.2.2.1 [util.smartptr.shared.const]</em></span> 250 When a <code class="classname">shared_ptr</code> constructor fails 251 <code class="classname">bad_alloc</code> (or types derived from it) will 252 be thrown, or when an allocator is passed to the constructor then any 253 exceptions thrown by the allocator. 254 </p><p> 255 <span class="emphasis"><em>20.7.2.0 [util.smartptr.weakptr]</em></span> 256 <code class="code">what()</code> returns <code class="literal">"bad_weak_ptr"</code>. 257 </p><p> 258 <span class="emphasis"><em>20.8.9.1.3 [func.bind.place]/1</em></span> There are 29 259 placeholders defined and the placeholder types are 260 <code class="literal">CopyAssignable</code>. 261 </p><p> 262 <span class="emphasis"><em>20.11.7.1 [time.clock.system]/3, /4</em></span> 263 Time point values are truncated to <code class="code">time_t</code> values. 264 There is no loss of precision for conversions in the other direction. 265 </p><p> 266 <span class="emphasis"><em>20.15.7 [meta.trans]/2</em></span> 267 <code class="classname">aligned_storage</code> does not support extended 268 alignment. 269 </p><p> 270 <span class="emphasis"><em>21.2.3.2 [char.traits.specializations.char16_t]</em></span>, 271 <span class="emphasis"><em>21.2.3.3 [char.traits.specializations.char32_t]</em></span> 272 The types <code class="classname">u16streampos</code> and 273 <code class="classname">u32streampos</code> are both synonyms for 274 <code class="classname">fpos<mbstate_t></code>. 275 The function <code class="function">eof</code> returns <code class="code">int_type(-1)</code>. 276 <code class="function">char_traits<char16_t>::to_int_type</code> will 277 transform the "noncharacter" U+FFFF to U+FFFD (REPLACEMENT CHARACTER). 278 This is done to ensure that <code class="function">to_int_type</code> never 279 returns the same value as <code class="function">eof</code>, which is U+FFFF. 280 </p><p> 281 <span class="emphasis"><em>22.3.1 [locale]</em></span> 282 There is one global locale for the whole program, not per-thread. 283 </p><p> 284 <span class="emphasis"><em>22.4.5.1.2 [locale.time.get.virtuals]</em></span>, 285 <span class="emphasis"><em>22.4.5.3.2 [locale.time.put.virtuals]</em></span> 286 Additional supported formats should be documented here. 287 </p><p> 288 <span class="emphasis"><em> 22.4.7.1.2 [locale.messages.virtuals]</em></span> 289 The mapping should be documented here. 290 </p><p> 291 <span class="emphasis"><em>23.3.2.1 [array.overview]</em></span> 292 <code class="classname">array<T, N>::iterator</code> is <code class="code">T*</code> and 293 <code class="classname">array<T, N>::const_iterator</code> is 294 <code class="code">const T*</code>. 295 </p><p> 296 <span class="emphasis"><em>23.5.4.2 [unord.map.cnstr]</em></span>, 297 <span class="emphasis"><em>23.5.5.2 [unord.multimap.cnstr]</em></span>, 298 <span class="emphasis"><em>23.5.6.2 [unord.set.cnstr]</em></span>, 299 <span class="emphasis"><em>23.5.7.2 [unord.multiset.cnstr]</em></span> 300 The default minimal bucket count is 0 for the default constructors, range 301 constructors and initializer-list constructors. 302 </p><p> 303 <span class="emphasis"><em>25.3.12 [alg.random.shuffle]</em></span> 304 The two-argument overload of <code class="function">random_shuffle</code> 305 uses <code class="function">rand</code> as the source of randomness. 306 </p><p> 307 <span class="emphasis"><em>26.5.5 [rand.predef]</em></span> 308 The type <code class="classname">default_random_engine</code> is a synonym for 309 <code class="classname">minstd_rand0</code>. 310 </p><p> 311 <span class="emphasis"><em> 26.5.6 [rand.device] </em></span> 312 The <code class="code">token</code> parameter of the 313 <code class="classname">random_device</code> constructor can be used to select 314 a specific source of random bytes. The valid token values are shown 315 in the list below. 316 The default constructor uses the token <code class="literal">"default"</code>. 317 </p><div class="variablelist"><dl class="variablelist"><dt><span class="term"><code class="literal">"default"</code></span></dt><dd> 318 Select the first available source from the other entries below. 319 This is the only token that is always valid. 320 </dd><dt><span class="term"><code class="literal">"rand_s"</code></span></dt><dd> 321 Use the MSVCRT <code class="function">rand_s</code> function. 322 This token is only valid for mingw-w64 targets. 323 </dd><dt><span class="term"><code class="literal">"rdseed"</code>, </span><span class="term"><code class="literal">"rdrand"</code> or <code class="literal">"rdrnd"</code></span></dt><dd> 324 Use the IA-32 <code class="literal">RDSEED</code> or <code class="literal">RDRAND</code> 325 instruction to read from an on-chip hardware random number generator. 326 These tokens are only valid for x86 and x86_64 targets when both 327 the assembler and CPU support the corresponding instruction. 328 </dd><dt><span class="term"><code class="literal">"darn"</code></span></dt><dd> 329 Use the Power ISA-3.0 <code class="literal">DARN</code> 330 ("Deliver A Random Number") 331 instruction to read from an on-chip hardware random number generator. 332 This token is only valid for 64-bit powerpc targets when both 333 the assembler and CPU support the corresponding instruction. 334 </dd><dt><span class="term"><code class="literal">"hw"</code>, </span><span class="term"><code class="literal">"hardware"</code></span></dt><dd> 335 Use any available CPU 336 instruction to read from an on-chip hardware random number generator. 337 This is equivalent to trying each of the following and using the 338 first that is supported: 339 <code class="literal">"rdseed"</code><code class="literal">"rdrand"</code><code class="literal">"darn"</code></dd><dt><span class="term"><code class="literal">"arc4random"</code>, </span><span class="term"><code class="literal">"getentropy"</code></span></dt><dd> 340 Use the named C library function, if available on the target. 341 </dd><dt><span class="term"><code class="literal">"/dev/urandom"</code>, </span><span class="term"><code class="literal">"/dev/random"</code></span></dt><dd> 342 Use the named character special file to read random bytes from. 343 These tokens are only valid when the device files are present 344 and readable by the current user. 345 </dd><dt><span class="term"><code class="literal">"mt19937"</code>, </span><span class="term">seed value</span></dt><dd> 346 When no source of nondeterministic random numbers is available a 347 <code class="classname">mersenne_twister_engine</code> will be used. 348 An integer seed value can be used as the token and will be converted 349 to an <code class="code">unsigned long</code> using <code class="function">strtoul</code>. 350 These tokens are only valid when no other source of random bytes 351 is available. 352 </dd></dl></div><p> 353 An exception of type <code class="classname">runtime_error</code> will be 354 thrown if a <code class="classname">random_device</code> object is constructed 355 with an invalid token, or if it cannot open or read from the source 356 of random bytes. 357 </p><p> 358 <span class="emphasis"><em>26.5.8.1 [rand.dist.general]</em></span> 359 The algorithms used by the distributions should be documented here. 360 </p><p> 361 <span class="emphasis"><em>26.8 [c.math]</em></span> Whether the 362 <code class="function">rand</code> function introduces data races depends on 363 the C library as the function is not provided by libstdc++. 364 </p><p> 365 <span class="emphasis"><em>27.8.2.1 [stringbuf.cons]</em></span> 366 Whether the sequence pointers are copied by the 367 <code class="classname">basic_stringbuf</code> move constructor should be 368 documented here. 369 </p><p> 370 <span class="emphasis"><em>27.9.1.2 [filebuf.cons]</em></span> 371 Whether the sequence pointers are copied by the 372 <code class="classname">basic_filebuf</code> move constructor should be 373 documented here. 374 </p><p> 375 <span class="emphasis"><em>28.5.1 [re.synopt]</em></span>, 376 <span class="emphasis"><em> 28.5.2 [re.matchflag] </em></span>, 377 <span class="emphasis"><em> 28.5.3 [re.err] </em></span> 378 <code class="code">syntax_option_type</code>, <code class="code">match_flag_type</code> 379 and <code class="code">error_type</code> are unscoped enumeration types. 380 </p><p> 381 <span class="emphasis"><em>28.7 [re.traits]</em></span> 382 The <code class="literal">blank</code> character class corresponds to the 383 <code class="code">ctype_base::blank</code> mask. 384 </p><p> 385 <span class="emphasis"><em>29.4 [atomics.lockfree]</em></span> 386 The values of the <code class="code">ATOMIC_xxx_LOCK_FREE</code> macros depend on 387 the target and cannot be listed here. 388 </p><p> 389 <span class="emphasis"><em>30.2.3 [thread.req.native]/1</em></span> 390 <code class="classname">native_handle_type</code> and 391 <code class="methodname">native_handle</code> are provided. The handle types 392 are defined in terms of the Gthreads abstraction layer, although this 393 is subject to change at any time. Any use of 394 <code class="classname">native_handle</code> is inherently non-portable and 395 not guaranteed to work between major releases of GCC. 396 </p><div class="variablelist"><dl class="variablelist"><dt><span class="term"><code class="classname">thread</code></span></dt><dd> 397 The native handle type is a typedef for <code class="code">__gthread_t</code> 398 i.e. <code class="code">pthread_t</code> when GCC is configured with the 399 <code class="literal">posix</code> thread model. 400 The value of the native handle is undefined for a thread 401 which is not joinable. 402 </dd><dt><span class="term"><code class="classname">mutex</code>, </span><span class="term"><code class="classname">timed_mutex</code></span></dt><dd> 403 The native handle type is <code class="code">__gthread_mutex_t*</code> i.e. 404 <code class="code">pthread_mutex_t*</code> for the <code class="literal">posix</code> 405 thread model. 406 </dd><dt><span class="term"><code class="classname">recursive_mutex</code>, </span><span class="term"><code class="classname">recursive_timed_mutex</code></span></dt><dd> 407 The native handle type is <code class="code">__gthread_recursive_mutex_t*</code> 408 i.e. <code class="code">pthread_mutex_t*</code> for the <code class="literal">posix</code> 409 thread model. 410 </dd><dt><span class="term"><code class="classname">condition_variable</code></span></dt><dd> 411 The native handle type is <code class="code">__gthread_cond_t*</code> i.e. 412 <code class="code">pthread_cond_t*</code> for the <code class="literal">posix</code> 413 thread model. 414 </dd></dl></div><p> 415 </p><p> 416 <span class="emphasis"><em>30.6.1 [futures.overview]/2</em></span> 417 <code class="code">launch</code> is a scoped enumeration type with 418 overloaded operators to support bitmask operations. There are no 419 additional bitmask elements defined. 420 </p></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="status.iso.2014"></a>C++ 2014</h3></div></div></div><p> 421 In this implementation the <code class="literal">-std=gnu++14</code> or 422 <code class="literal">-std=c++14</code> flag must be used to enable language 423 and library 424 features. See <a class="link" href="using.html#manual.intro.using.flags" title="Command Options">dialect</a> 425 options. The pre-defined symbol 426 <code class="constant">__cplusplus</code> is used to check for the 427 presence of the required flag. 428 GCC 6.1 was the first release with non-experimental C++14 support, 429 so the API and ABI of features added in C++14 is only stable 430 since that release. 431 </p><p> 432 This status table is based on the table of contents of ISO/IEC 14882:2014. 433 Some subclauses are not shown in the table where the content is unchanged 434 since C++11 and the implementation is complete. 435 </p><p> 436 This section describes the C++14 and library TS support in 437 the GCC 14 release series. 438 </p><div class="table"><a id="table.cxx14_status"></a><p class="title"><strong>Table1.3.C++ 2014 Implementation Status</strong></p><div class="table-contents"><table class="table" summary="C++ 2014 Implementation Status" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /></colgroup><thead><tr><th align="left">Section</th><th align="left">Description</th><th align="left">Status</th><th align="left">Comments</th></tr></thead><tbody><tr><td align="left"> 439 <span class="emphasis"><em>18</em></span> 440 </td><td colspan="3" align="left"> 441 <span class="emphasis"><em>Language support</em></span> 442 </td></tr><tr><td align="left">18.1</td><td align="left">General</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">18.2</td><td align="left">Types</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.3</td><td align="left">Implementation properties</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">18.3.2</td><td align="left">Numeric Limits</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">18.3.2.3</td><td align="left">Class template <code class="code">numeric_limits</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.3.2.4</td><td align="left"><code class="code">numeric_limits</code> members</td><td align="left">Y</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">18.3.2.5</td><td align="left"><code class="code">float_round_style</code></td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">18.3.2.6</td><td align="left"><code class="code">float_denorm_style</code></td><td align="left">N</td><td align="left"></td></tr><tr><td align="left">18.3.2.7</td><td align="left"><code class="code">numeric_limits</code> specializations</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.3.3</td><td align="left">C Library</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.4</td><td align="left">Integer types</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">18.4.1</td><td align="left">Header <code class="code"><cstdint></code> synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr bgcolor="#B0B0B0"><td align="left">18.5</td><td align="left">Start and termination</td><td align="left">Partial</td><td align="left">C library dependency for quick_exit, at_quick_exit</td></tr><tr><td align="left">18.6</td><td align="left">Dynamic memory management</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.7</td><td align="left">Type identification</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">18.7.1</td><td align="left">Class type_info</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.7.2</td><td align="left">Class bad_cast</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.7.3</td><td align="left">Class bad_typeid</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.8</td><td align="left">Exception handling</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">18.8.1</td><td align="left">Class exception</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.8.2</td><td align="left">Class bad_exception</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.8.3</td><td align="left">Abnormal termination</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.8.4</td><td align="left"><code class="code">uncaught_exception</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.8.5</td><td align="left">Exception Propagation</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.8.6</td><td align="left"><code class="code">nested_exception</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.9</td><td align="left">Initializer lists</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">18.9.1</td><td align="left">Initializer list constructors</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.9.2</td><td align="left">Initializer list access</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.9.3</td><td align="left">Initializer list range access</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">18.10</td><td align="left">Other runtime support</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"> 443 <span class="emphasis"><em>19</em></span> 444 </td><td colspan="3" align="left"> 445 <span class="emphasis"><em>Diagnostics</em></span> 446 </td></tr><tr><td align="left">19.1</td><td align="left">General</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">19.2</td><td align="left">Exception classes</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">19.3</td><td align="left">Assertions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">19.4</td><td align="left">Error numbers</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">19.5</td><td align="left">System error support</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">19.5.1</td><td align="left">Class <code class="code">error_category</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">19.5.2</td><td align="left">Class <code class="code">error_code</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">19.5.3</td><td align="left">Class <code class="code">error_condition</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">19.5.4</td><td align="left">Comparison operators</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">19.5.5</td><td align="left">Class <code class="code">system_error</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"> 447 <span class="emphasis"><em>20</em></span> 448 </td><td colspan="3" align="left"> 449 <span class="emphasis"><em>General utilities</em></span> 450 </td></tr><tr><td align="left">20.1</td><td align="left">General</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">20.2</td><td align="left">Utility components</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">20.2.1</td><td align="left">Operators</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.2.2</td><td align="left">swap</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.2.3</td><td align="left">exchange</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.2.4</td><td align="left">forward/move helpers</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.2.5</td><td align="left">Function template <code class="code">declval</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.3</td><td align="left">Pairs</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.4</td><td align="left">Tuples</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.5</td><td align="left">Compile-time integer sequences</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">20.5.2</td><td align="left">Class template <code class="code">integer_sequence</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.5.3</td><td align="left">Alias template <code class="code">make_integer_sequence</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.6</td><td align="left">Class template <code class="code">bitset</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.7</td><td align="left">Memory</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.8</td><td align="left">Smart pointers</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">20.8.1</td><td align="left">Class template <code class="code">unique_ptr</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.8.1.1</td><td align="left">Default deleters</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.8.1.2</td><td align="left"><code class="code">unique_ptr</code> for single objects</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.8.1.3</td><td align="left"><code class="code">unique_ptr</code> for array objects with a runtime length</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.8.1.4</td><td align="left"><code class="code">unique_ptr</code> creation</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.8.1.5</td><td align="left"><code class="code">unique_ptr</code> specialized algorithms</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.8.2</td><td align="left">Shared-ownership pointers</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">20.8.2.1</td><td align="left">Class <code class="code">bad_weak_ptr</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.8.2.2</td><td align="left">Class template <code class="code">shared_ptr</code></td><td align="left">Y</td><td align="left"> 451 Uses code from 452 <a class="link" href="http://www.boost.org/libs/smart_ptr/shared_ptr.htm" target="_top">boost::shared_ptr</a>. 453 </td></tr><tr><td align="left">20.8.2.3</td><td align="left">Class template <code class="code">weak_ptr</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.8.2.4</td><td align="left">Class template <code class="code">owner_less</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.8.2.5</td><td align="left">Class template <code class="code">enable_shared_from_this</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.8.2.6</td><td align="left"><code class="code">shared_ptr</code> atomic access</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.8.2.7</td><td align="left">Smart pointer hash support</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.9</td><td align="left">Function objects</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">20.9.1</td><td align="left">Definitions</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">20.9.2</td><td align="left">Requirements</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">20.9.3</td><td align="left">Class template <code class="code">reference_wrapper</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.9.4</td><td align="left">Arithmetic operation</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.9.5</td><td align="left">Comparisons</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.8.6</td><td align="left">Logical operations</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.9.7</td><td align="left">Bitwise operations</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.9.8</td><td align="left">Negators</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.9.9</td><td align="left">Function object binders</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.9.10</td><td align="left">Function template <code class="code">mem_fn</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.9.11</td><td align="left">Polymorphic function wrappers</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">20.9.11.1</td><td align="left">Class <code class="code">bad_function_call</code></td><td align="left">Y</td><td align="left"></td></tr><tr bgcolor="#B0B0B0"><td align="left">20.9.11.2</td><td align="left">Class template <code class="code">function</code></td><td align="left">Partial</td><td align="left">Missing allocator support</td></tr><tr><td align="left">20.9.12</td><td align="left">Class template <code class="code">hash</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.10</td><td align="left">Metaprogramming and type traits</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">20.10.1</td><td align="left">Requirements</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.10.2</td><td align="left">Header <code class="code"><type_traits></code> synopsis</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">20.10.3</td><td align="left">Helper classes</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.10.4</td><td align="left">Unary Type Traits</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.10.5</td><td align="left">Type property queries</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.10.6</td><td align="left">Relationships between types</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.10.7</td><td align="left">Transformations between types</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.11</td><td align="left">Compile-time rational arithmetic</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.12</td><td align="left">Time utilities</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">20.12.3</td><td align="left">Clock requirements</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.12.4</td><td align="left">Time-related traits</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.12.5</td><td align="left">Class template <code class="code">duration</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.12.5.8</td><td align="left">Suffixes for duration literals</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.12.6</td><td align="left">Class template <code class="code">time_point</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.12.7</td><td align="left">Clocks</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.12.8</td><td align="left">Date and time functions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.13</td><td align="left">Scoped allocator adaptor</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">20.14</td><td align="left">Class <code class="code">type_index</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"> 454 <span class="emphasis"><em>21</em></span> 455 </td><td colspan="3" align="left"> 456 <span class="emphasis"><em>Strings</em></span> 457 </td></tr><tr><td align="left">21.1</td><td align="left">General</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">21.2</td><td align="left">Character traits</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">21.3</td><td align="left">String classes</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">21.4</td><td align="left">Class template <code class="code">basic_string</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">21.5</td><td align="left">Numeric Conversions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">21.6</td><td align="left">Hash support</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">21.7</td><td align="left">Suffixes for <code class="code">basic_string</code> literals</td><td align="left">Y</td><td align="left"></td></tr><tr bgcolor="#B0B0B0"><td align="left">21.7</td><td align="left">Null-terminated sequence utilities</td><td align="left">Partial</td><td align="left">C library dependency. </td></tr><tr><td align="left"> 458 <span class="emphasis"><em>22</em></span> 459 </td><td colspan="3" align="left"> 460 <span class="emphasis"><em>Localization</em></span> 461 </td></tr><tr><td align="left">22.1</td><td align="left">General</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.2</td><td align="left">Header <code class="code"><locale></code> synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.3</td><td align="left">Locales</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.4</td><td align="left">Standard <code class="code">locale</code> categories</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.5</td><td align="left">Standard code conversion facets</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.6</td><td align="left">C Library Locales</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"> 462 <span class="emphasis"><em>23</em></span> 463 </td><td colspan="3" align="left"> 464 <span class="emphasis"><em>Containers</em></span> 465 </td></tr><tr><td align="left">23.1</td><td align="left">General</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">23.2</td><td align="left">Container requirements</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.3</td><td align="left">Sequence containers</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.4</td><td align="left">Associative containers</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.5</td><td align="left">Unordered associative containers</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.6</td><td align="left">Container adaptors</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"> 466 <span class="emphasis"><em>24</em></span> 467 </td><td colspan="3" align="left"> 468 <span class="emphasis"><em>Iterators</em></span> 469 </td></tr><tr><td align="left">24.1</td><td align="left">General</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">24.2</td><td align="left">Iterator requirements</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">24.3</td><td align="left">Header <code class="code"><iterator></code> synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">24.4</td><td align="left">Iterator primitives</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">24.5</td><td align="left">Iterator adaptors</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">24.6</td><td align="left">Stream iterators</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">24.7</td><td align="left">range access</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"> 470 <span class="emphasis"><em>25</em></span> 471 </td><td colspan="3" align="left"> 472 <span class="emphasis"><em>Algorithms</em></span> 473 </td></tr><tr><td align="left">25.1</td><td align="left">General</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">25.2</td><td align="left">Non-modifying sequence operations</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">25.3</td><td align="left">Mutating sequence operations</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">25.4</td><td align="left">Sorting and related operations</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">25.5</td><td align="left">C library algorithms</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"> 474 <span class="emphasis"><em>26</em></span> 475 </td><td colspan="3" align="left"> 476 <span class="emphasis"><em>Numerics</em></span> 477 </td></tr><tr><td align="left">26.1</td><td align="left">General</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">26.2</td><td align="left">Numeric type requirements</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.3</td><td align="left">The floating-point environment</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.4</td><td align="left">Complex numbers</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.4.10</td><td align="left">Suffixes for complex number literals</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.5</td><td align="left">Random number generation</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.6</td><td align="left">Numeric arrays</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.7</td><td align="left">Generalized numeric operations</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.8</td><td align="left">C Library</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"> 478 <span class="emphasis"><em>27</em></span> 479 </td><td colspan="3" align="left"> 480 <span class="emphasis"><em>Input/output library</em></span> 481 </td></tr><tr><td align="left">27.1</td><td align="left">General</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">27.2</td><td align="left">Iostreams requirements</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">27.2.1</td><td align="left">Imbue Limitations</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">27.2.2</td><td align="left">Positioning Type Limitations</td><td align="left">Y</td><td align="left"></td></tr><tr bgcolor="#B0B0B0"><td align="left">27.2.3</td><td align="left">Thread safety</td><td align="left">Partial</td><td align="left"></td></tr><tr><td align="left">27.3</td><td align="left">Forward declarations</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">27.4</td><td align="left">Standard iostream objects</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">27.5</td><td align="left">Iostreams base classes</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">27.6</td><td align="left">Stream buffers</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">27.7</td><td align="left">Formatting and manipulators</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">27.7.6</td><td align="left">Quoted manipulators</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">27.8</td><td align="left">String-based streams</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">27.9</td><td align="left">File-based streams</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"> 482 <span class="emphasis"><em>28</em></span> 483 </td><td colspan="3" align="left"> 484 <span class="emphasis"><em>Regular expressions</em></span> 485 </td></tr><tr><td align="left">28.1</td><td align="left">General</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">28.2</td><td align="left">Definitions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">28.3</td><td align="left">Requirements</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">28.4</td><td align="left">Header <code class="code"><regex></code> synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">28.5</td><td align="left">Namespace <code class="code">std::regex_constants</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">28.6</td><td align="left">Class <code class="code">regex_error</code></td><td align="left">Y</td><td align="left"></td></tr><tr bgcolor="#B0B0B0"><td align="left">28.7</td><td align="left">Class template <code class="code">regex_traits</code></td><td align="left">Partial</td><td align="left"><code class="code">transform_primary</code> is not correctly implemented</td></tr><tr><td align="left">28.8</td><td align="left">Class template <code class="code">basic_regex</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">28.9</td><td align="left">Class template <code class="code">sub_match</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">28.10</td><td align="left">Class template <code class="code">match_results</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">28.11</td><td align="left">Regular expression algorithms</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">28.12</td><td align="left">Regular expression Iterators</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">28.13</td><td align="left">Modified ECMAScript regular expression grammar</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"> 486 <span class="emphasis"><em>29</em></span> 487 </td><td colspan="3" align="left"> 488 <span class="emphasis"><em>Atomic operations</em></span> 489 </td></tr><tr><td align="left">29.1</td><td align="left">General</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">29.2</td><td align="left">Header <code class="code"><atomic></code> synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">29.3</td><td align="left">Order and consistency</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">29.4</td><td align="left">Lock-free property</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">29.5</td><td align="left">Atomic types</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">29.6</td><td align="left">Operations on atomic types</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">29.7</td><td align="left">Flag Type and operations</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">29.8</td><td align="left">Fences</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"> 490 <span class="emphasis"><em>30</em></span> 491 </td><td colspan="3" align="left"> 492 <span class="emphasis"><em>Thread support</em></span> 493 </td></tr><tr><td align="left">30.1</td><td align="left">General</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.2</td><td align="left">Requirements</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.3</td><td align="left">Threads</td><td align="left"></td><td align="left"></td></tr><tr bgcolor="#B0B0B0"><td align="left">30.3.1</td><td align="left">Class <code class="code">thread</code></td><td align="left">Partial</td><td align="left"><code class="code">thread::id</code> comparisons not well-defined</td></tr><tr><td align="left">30.3.2</td><td align="left">Namespace <code class="code">this_thread</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.4</td><td align="left">Mutual exclusion</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">30.4.1</td><td align="left">Mutex requirements</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">30.4.1.1</td><td align="left">In general</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">30.4.1.2</td><td align="left">Mutex types</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">30.4.1.2.1</td><td align="left">Class <code class="code">mutex</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.4.1.2.2</td><td align="left">Class <code class="code">recursive_mutex</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.4.1.3</td><td align="left">Timed mutex types</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">30.4.1.3.1</td><td align="left">Class <code class="code">timed_mutex</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.4.1.3.2</td><td align="left">Class <code class="code">recursive_timed_mutex</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.4.1.4</td><td align="left">Shared timed mutex types</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">30.4.1.4.1</td><td align="left">Class <code class="code">shared_timed_mutex</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.4.2</td><td align="left">Locks</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">30.4.2.1</td><td align="left">Class template <code class="code">lock_guard</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.4.2.2</td><td align="left">Class template <code class="code">unique_lock</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.4.2.3</td><td align="left">Class template <code class="code">shared_lock</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.4.3</td><td align="left">Generic locking algorithms</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.4.4</td><td align="left">Call once</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">30.4.4.1</td><td align="left">Struct <code class="code">once_flag</code></td><td align="left">Y</td><td align="left"></td></tr><tr bgcolor="#B0B0B0"><td align="left">30.4.4.2</td><td align="left">Function <code class="code">call_once</code></td><td align="left">Broken</td><td align="left">Exception support is broken. 494 See <a class="link" href="https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66146" target="_top">PR 495 66146</a>. 496 </td></tr><tr><td align="left">30.5</td><td align="left">Condition variables</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.5.1</td><td align="left">Class <code class="code">condition_variable</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.5.2</td><td align="left">Class <code class="code">condition_variable_any</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.6</td><td align="left">Futures</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">30.6.1</td><td align="left">Overview</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">30.6.2</td><td align="left">Error handling</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.6.3</td><td align="left">Class <code class="code">future_error</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.6.4</td><td align="left">Shared state</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.6.5</td><td align="left">Class template <code class="code">promise</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.6.6</td><td align="left">Class template <code class="code">future</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.6.7</td><td align="left">Class template <code class="code">shared_future</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.6.8</td><td align="left">Function template <code class="code">async</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.6.9</td><td align="left">Class template <code class="code">packaged_task</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"> 497 <span class="emphasis"><em>Appendix D</em></span> 498 </td><td colspan="3" align="left"> 499 <span class="emphasis"><em>Compatibility features</em></span> 500 </td></tr><tr><td align="left">D.1</td><td align="left">Increment operator with <code class="code">bool</code> operand</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">D.2</td><td align="left"><code class="code">register</code> keyword</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">D.3</td><td align="left">Implicit declaration of copy functions</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">D.4</td><td align="left">Dynamic exception specifications</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">D.5</td><td align="left">C standard library headers</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">D.6</td><td align="left">Old iostreams members</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">D.7</td><td align="left"><code class="code">char*</code> streams</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">D.8</td><td align="left">Function objects</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">D.9</td><td align="left">Binders</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">D.10</td><td align="left"><code class="code">auto_ptr</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">D.11</td><td align="left">Violating exception-specifications</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">D.12</td><td align="left">Random shuffle</td><td align="left">Y</td><td align="left"></td></tr></tbody></table></div></div><br class="table-break" /><div class="table"><a id="table.ts_status"></a><p class="title"><strong>Table1.4.C++ Technical Specifications Implementation Status</strong></p><div class="table-contents"><table class="table" summary="C++ Technical Specifications Implementation Status" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /></colgroup><thead><tr><th align="left">Paper</th><th align="left">Title</th><th align="left">Status</th><th align="left">Comments</th></tr></thead><tbody><tr bgcolor="#C8B0B0"><td align="left"> 501 <a class="link" href="https://www.open-std.org/JTC1/sc22/WG21/docs/papers/2013/n3662.html" target="_top"> 502 N3662 503 </a> 504 </td><td align="left">C++ Dynamic Arrays</td><td align="left">N</td><td align="left">Array Extensions TS</td></tr><tr><td align="left"> 505 <a class="link" href="https://www.open-std.org/JTC1/SC22/WG21/docs/papers/2013/n3793.html" target="_top"> 506 N3793 507 </a> 508 </td><td align="left">A proposal to add a utility class to represent optional objects</td><td align="left">Y</td><td align="left">Library Fundamentals TS</td></tr><tr><td align="left"> 509 <a class="link" href="https://www.open-std.org/JTC1/SC22/WG21/docs/papers/2013/n3804.html" target="_top"> 510 N3804 511 </a> 512 </td><td align="left">Any library proposal</td><td align="left">Y</td><td align="left">Library Fundamentals TS</td></tr><tr bgcolor="#C8B0B0"><td align="left"> 513 <a class="link" href="https://www.open-std.org/JTC1/SC22/WG21/docs/papers/2014/n3866.html" target="_top"> 514 N3866 515 </a> 516 </td><td align="left">Invocation type traits, but dropping function_call_operator.</td><td align="left">N</td><td align="left">Library Fundamentals TS</td></tr><tr><td align="left"> 517 <a class="link" href="" target="_top"> 518 N3905 519 </a> 520 </td><td align="left">Faster string searching (Boyer-Moore et al.)</td><td align="left">Y</td><td align="left">Library Fundamentals TS</td></tr><tr><td align="left"> 521 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3915.pdf" target="_top"> 522 N3915 523 </a> 524 </td><td align="left">apply() call a function with arguments from a tuple</td><td align="left">Y</td><td align="left">Library Fundamentals TS</td></tr><tr bgcolor="#B0B0B0"><td align="left"> 525 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3916.pdf" target="_top"> 526 N3916 527 </a> 528 </td><td align="left">Polymorphic memory resources</td><td align="left">Partial (missing pool resource and buffer resource classes)</td><td align="left">Library Fundamentals TS</td></tr><tr><td align="left"> 529 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3920.html" target="_top"> 530 N3920 531 </a> 532 </td><td align="left">Extending shared_ptr to support arrays</td><td align="left">Y</td><td align="left">Library Fundamentals TS</td></tr><tr><td align="left"> 533 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3921.html" target="_top"> 534 N3921 535 </a> 536 </td><td align="left"><code class="code">string_view</code>: a non-owning reference to a string</td><td align="left">Y</td><td align="left">Library Fundamentals TS</td></tr><tr><td align="left"> 537 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3925.pdf" target="_top"> 538 N3925 539 </a> 540 </td><td align="left">A sample proposal</td><td align="left">Y</td><td align="left">Library Fundamentals TS</td></tr><tr><td align="left"> 541 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3932.htm" target="_top"> 542 N3932 543 </a> 544 </td><td align="left">Variable Templates For Type Traits</td><td align="left">Y</td><td align="left">Library Fundamentals TS</td></tr><tr><td align="left"> 545 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4100.pdf" target="_top"> 546 N4100 547 </a> 548 </td><td align="left">File System</td><td align="left">Y</td><td align="left"> 549 Link with 550 <a class="link" href="using_dynamic_or_shared.html#manual.intro.using.linkage.experimental" title="Experimental Library Extensions"> 551 <code class="option">-lstdc++fs</code></a> 552 </td></tr></tbody></table></div></div><br class="table-break" /><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="iso.2014.specific"></a>Implementation Specific Behavior</h4></div></div></div><div class="section"><div class="titlepage"><div><div><h5 class="title"><a id="iso.2014.filesystemts"></a>Filesystem TS</h5></div></div></div><p> 553 <span class="emphasis"><em>2.1 POSIX conformance [fs.conform.9945]</em></span> 554 The behavior of the filesystem library implementation will depend on 555 the target operating system. Some features will not be supported 556 on some targets. Symbolic links and file permissions 557 are not supported on Windows. 558 </p><p> 559 <span class="emphasis"><em>15.30 Rename [fs.op.rename]</em></span> 560 On Windows, <code class="code">experimental::filesystem::rename</code> 561 is implemented by calling <code class="code">MoveFileExW</code> and so 562 does not meet the requirements of POSIX <code class="code">rename</code> 563 when one or both of the paths resolves to an existing directory. 564 Specifically, it is possible to rename a directory so it replaces 565 a non-directory (POSIX requires an error in that case), 566 and it is not possible to rename a directory to replace another 567 directory (POSIX requires that to work if the directory being 568 replaced is empty). 569 </p></div></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="status.iso.2017"></a>C++ 2017</h3></div></div></div><p> 570 In this implementation the <code class="literal">-std=gnu++17</code> or 571 <code class="literal">-std=c++17</code> flag must be used to enable language 572 and library 573 features. See <a class="link" href="using.html#manual.intro.using.flags" title="Command Options">dialect</a> 574 options. The pre-defined symbol 575 <code class="constant">__cplusplus</code> is used to check for the 576 presence of the required flag. 577 GCC 9.1 was the first release with non-experimental C++17 support, 578 so the API and ABI of features added in C++17 is only stable 579 since that release. 580 </p><p> 581 This section describes the C++17 and library TS support in 582 the GCC 14 release series. 583 </p><p> 584 The following table lists new library features that are included in 585 the C++17 standard. The "Proposal" column provides a link to the 586 ISO C++ committee proposal that describes the feature, while the "Status" 587 column indicates the first version of GCC that contains an implementation of 588 this feature (if it has been implemented). 589 The "SD-6 Feature Test" column shows the corresponding macro or header from 590 <a class="link" href="https://isocpp.org/std/standing-documents/sd-6-sg10-feature-test-recommendations" target="_top">SD-6: 591 Feature-testing recommendations for C++</a>. 592 </p><div class="table"><a id="table.cxx17_features"></a><p class="title"><strong>Table1.5.C++ 2017 Library Features</strong></p><div class="table-contents"><table class="table" summary="C++ 2017 Library Features" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /></colgroup><thead><tr><th align="left">Library Feature</th><th align="left">Proposal</th><th align="left">Status</th><th align="left">SD-6 Feature Test</th></tr></thead><tbody><tr><td align="left"> 593 <code class="code">constexpr std::hardware_{constructive,destructive}_interference_size</code> 594 </td><td align="left"> 595 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0154r1.html" target="_top"> 596 P0154R1 597 </a> 598 </td><td align="center"> 12.1 </td><td align="left"> <code class="code">__cpp_lib_hardware_interference_size >= 201603</code> </td></tr><tr><td align="left"> Core Issue 1776: Replacement of class objects containing reference members</td><td align="left"> 599 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0137r1.html" target="_top"> 600 P0137R1 601 </a> 602 </td><td align="center"> 7.1 </td><td align="left"> <code class="code">__cpp_lib_launder >= 201606</code> </td></tr><tr><td align="left">Wording for <code class="code">std::uncaught_exceptions</code></td><td align="left"> 603 <a class="link" href="https://www.open-std.org/JTC1/sc22/WG21/docs/papers/2014/n4259.pdf" target="_top"> 604 N4259 605 </a> 606 </td><td align="center">6.1</td><td align="left"><code class="code">__cpp_lib_uncaught_exceptions >= 201411</code></td></tr><tr><td align="left"> C++17 should refer to C11 instead of C99 </td><td align="left"> 607 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0063r3.html" target="_top"> 608 P0063R3 609 </a> 610 </td><td align="center"> 9.1 </td><td align="left"></td></tr><tr><td align="left"> Variant: a type-safe union for C++17 </td><td align="left"> 611 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0088r3.html" target="_top"> 612 P0088R3 613 </a> 614 </td><td align="center"> 7.1 </td><td align="left"> <code class="code">__has_include(<variant>)</code>, 615 <code class="code">__cpp_lib_variant >= 201603</code> 616 (since 7.3, see Note 1) 617 </td></tr><tr><td align="left"> Library Fundamentals V1 TS Components: <code class="code">optional</code> </td><td align="left"> 618 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0220r1.html" target="_top"> 619 P0220R1 620 </a> 621 </td><td align="center"> 7.1 </td><td align="left"> <code class="code">__has_include(<optional>)</code>, 622 <code class="code">__cpp_lib_optional >= 201603</code> 623 (since 7.3, see Note 1) 624 </td></tr><tr><td align="left"> Library Fundamentals V1 TS Components: <code class="code">any</code> </td><td align="left"> 625 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0220r1.html" target="_top"> 626 P0220R1 627 </a> 628 </td><td align="center"> 7.1 </td><td align="left"> <code class="code">__has_include(<any>)</code>, 629 <code class="code">__cpp_lib_any >= 201603</code> 630 (since 7.3, see Note 1) 631 </td></tr><tr><td align="left"> Library Fundamentals V1 TS Components: <code class="code">string_view</code> </td><td align="left"> 632 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0220r1.html" target="_top"> 633 P0220R1 634 </a> 635 </td><td align="center"> 7.1 </td><td align="left"> <code class="code">__has_include(<string_view>)</code>, 636 <code class="code">__cpp_lib_string_view >= 201603</code> 637 (since 7.3, see Note 1) 638 </td></tr><tr><td align="left"> Library Fundamentals V1 TS Components: <code class="code">memory_resource</code> </td><td align="left"> 639 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0220r1.html" target="_top"> 640 P0220R1 641 </a> 642 </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__has_include(<memory_resource>)</code>, 643 <code class="code">__cpp_lib_memory_resource >= 201603</code> 644 </td></tr><tr><td align="left"> Library Fundamentals V1 TS Components: <code class="code">apply</code> </td><td align="left"> 645 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0220r1.html" target="_top"> 646 P0220R1 647 </a> 648 </td><td align="center"> 7.1 </td><td align="left"> <code class="code">__cpp_lib_apply >= 201603</code> </td></tr><tr><td align="left"> Library Fundamentals V1 TS Components: <code class="code">shared_ptr<T[]></code> </td><td align="left"> 649 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0220r1.html" target="_top"> 650 P0220R1 651 </a> 652 </td><td align="center"> 7.1 </td><td align="left"> <code class="code">__cpp_lib_shared_ptr_arrays >= 201603</code> </td></tr><tr><td align="left"> Library Fundamentals V1 TS Components: Searchers </td><td align="left"> 653 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0220r1.html" target="_top"> 654 P0220R1 655 </a> 656 </td><td align="center"> 7.1 </td><td align="left"> <code class="code">__cpp_lib_boyer_moore_searcher >= 201603</code> </td></tr><tr><td align="left"> Library Fundamentals V1 TS Components: Sampling </td><td align="left"> 657 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0220r1.html" target="_top"> 658 P0220R1 659 </a> 660 </td><td align="center"> 7.1 </td><td align="left"> <code class="code">__cpp_lib_sample >= 201603</code> </td></tr><tr><td align="left"> Constant View: A proposal for a <code class="code">std::as_const</code> helper function template </td><td align="left"> 661 <a class="link" href="" target="_top"> 662 P0007R1 663 </a> 664 </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_as_const >= 201510 </code></td></tr><tr><td align="left"> Improving pair and tuple </td><td align="left"> 665 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4387" target="_top"> 666 N4387 667 </a> 668 </td><td align="center"> 6.1 </td><td align="left"> N/A </td></tr><tr><td align="left"> <code class="code">make_from_tuple</code>: apply for construction </td><td align="left"> 669 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0209r2.pdf" target="_top"> 670 P0209R2 671 </a> 672 </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_make_from_tuple >= 201606 </code></td></tr><tr bgcolor="#C8B0B0"><td align="left"> 673 Removing <code class="code">auto_ptr</code>, <code class="code">random_shuffle()</code>, 674 And Old <code class="code"><functional></code> Stuff 675 </td><td align="left"> 676 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4190.htm" target="_top"> 677 N4190 678 </a> 679 </td><td align="center">No (kept for backwards compatibility)</td><td align="left"></td></tr><tr><td align="left"> Deprecating Vestigial Library Parts in C++17 </td><td align="left"> 680 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0174r2.html" target="_top"> 681 P0174R2 682 </a> 683 </td><td align="center"> 12.1 </td><td align="left"></td></tr><tr><td align="left"> Making <code class="code">std::owner_less</code> more flexible </td><td align="left"> 684 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0074r0.html" target="_top"> 685 P0074R0 686 </a> 687 </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_transparent_operators >= 201510 </code></td></tr><tr><td align="left"> <code class="code">std::addressof</code> should be constexpr </td><td align="left"> 688 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0304r0.html#2296" target="_top"> 689 LWG2296 690 </a> 691 </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_addressof_constexpr >= 201603 </code></td></tr><tr><td align="left"> Safe conversions in <code class="code">unique_ptr<T[]></code> </td><td align="left"> 692 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4089.pdf" target="_top"> 693 N4089 694 </a> 695 </td><td align="center"> 6 </td><td align="left"></td></tr><tr><td align="left"> LWG 2228: Missing SFINAE rule in unique_ptr templated assignment </td><td align="left"> 696 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4366.html" target="_top"> 697 N4366 698 </a> 699 </td><td align="center"> 6 </td><td align="left"></td></tr><tr><td align="left"> Re-enabling <code class="code">shared_from_this</code></td><td align="left"> 700 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0033r1.html" target="_top"> 701 P0033R1 702 </a> 703 </td><td align="center"> 7.1 </td><td align="left"><code class="code">__cpp_lib_enable_shared_from_this >= 201603</code></td></tr><tr><td align="left"> A proposal to add <code class="code">invoke</code> function template </td><td align="left"> 704 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4169.html" target="_top"> 705 N4169 706 </a> 707 </td><td align="center"> 6.1 </td><td align="left"><code class="code"> __cpp_lib_invoke >= 201411 </code></td></tr><tr><td align="left">TriviallyCopyable <code class="code">reference_wrapper</code> </td><td align="left"> 708 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4277.html" target="_top"> 709 N4277 710 </a> 711 </td><td align="center"> 5.1 </td><td align="left"></td></tr><tr><td align="left"> Adopt <code class="code">not_fn</code> from Library Fundamentals 2 for C++17 </td><td align="left"> 712 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0005r4.html" target="_top"> 713 P0005R4 714 </a> 715 </td><td align="center"> 7.1 </td><td align="left"><code class="code">__cpp_lib_not_fn >= 201603</code></td></tr><tr><td align="left"> Fixes for <code class="code">not_fn</code> </td><td align="left"> 716 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0358r1.html" target="_top"> 717 P0358R1 718 </a> 719 </td><td align="center"> 7.1 </td><td align="left"></td></tr><tr><td align="left"> Fixing a design mistake in the searchers interface in Library Fundamentals </td><td align="left"> 720 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0253r1.pdf" target="_top"> 721 P0253R1 722 </a> 723 </td><td align="center"> 7.1 </td><td align="left"></td></tr><tr><td align="left"> Extending memory management tools </td><td align="left"> 724 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0040r3.html" target="_top"> 725 P0040R3 726 </a> 727 </td><td align="center"> 7.1 </td><td align="left"><code class="code">__cpp_lib_raw_memory_algorithms >= 201606L</code></td></tr><tr><td align="left"> <code class="code">shared_ptr::weak_type</code></td><td align="left"> 728 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0163r0.html" target="_top"> 729 P0163R0 730 </a> 731 </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_shared_ptr_weak_type >= 201606</code></td></tr><tr><td align="left">Transformation Trait Alias <code class="code">void_t</code></td><td align="left"> 732 <a class="link" href="https://www.open-std.org/JTC1/sc22/WG21/docs/papers/2014/n3911.pdf" target="_top"> 733 N3911 734 </a> 735 </td><td align="center">6.1</td><td align="left"><code class="code"> __cpp_lib_void_t >= 201411</code></td></tr><tr><td align="left"> Wording for <code class="code">bool_constant</code>, revision 1 </td><td align="left"> 736 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4389.html" target="_top"> 737 N4389 738 </a> 739 </td><td align="center">6.1</td><td align="left"><code class="code"> __cpp_lib_bool_constant >= 201505</code></td></tr><tr><td align="left"> Adopt Type Traits Variable Templates from Library Fundamentals TS for C++17</td><td align="left"> 740 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0006r0.html" target="_top"> 741 P0006R0 742 </a> 743 </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_type_trait_variable_templates >= 201510 </code></td></tr><tr><td align="left"> Logical Operator Type Traits</td><td align="left"> 744 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0013r1.html" target="_top"> 745 P0013R1 746 </a> 747 </td><td align="center"> 6.1 </td><td align="left"><code class="code"> __cpp_lib_logical_traits >= 201510 </code></td></tr><tr><td align="left"> Adding [nothrow-]swappable traits </td><td align="left"> 748 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0185r1.html" target="_top"> 749 P0185R1 750 </a> 751 </td><td align="center"> 7.1 (<code class="code">__is_swappable</code> available since 6.1)</td><td align="left"><code class="code"> __cpp_lib_is_swappable >= 201603 </code></td></tr><tr><td align="left"> <code class="code">is_callable</code>, the missing INVOKE related trait</td><td align="left"> 752 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0077r2.html" target="_top"> 753 P0077R2 754 </a> 755 </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_is_invocable >= 201703 </code></td></tr><tr><td align="left"> has_unique_object_representations </td><td align="left"> 756 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0258r2.html" target="_top"> 757 P0258R2 758 </a> 759 </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_has_unique_object_representations >= 201606 </code></td></tr><tr><td align="left"> Polishing <code class="code"><chrono></code> </td><td align="left"> 760 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0092r1.html" target="_top"> 761 P0092R1 762 </a> 763 </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_chrono >= 201510 </code></td></tr><tr><td align="left"> Adding more constexpr to <code class="code"><chrono></code> </td><td align="left"> 764 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0505r0.html" target="_top"> 765 P0505R0 766 </a> 767 </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_chrono >= 201611 </code> 768 (since 7.3, see Note 2) 769 </td></tr><tr><td align="left"> Constexpr for <code class="code">std::char_traits</code> </td><td align="left"> 770 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0426r1.html" target="_top"> 771 P0426R1 772 </a> 773 </td><td align="center"> 8.1 </td><td align="left"><code class="code"> __cpp_lib_constexpr_string >= 201611 </code></td></tr><tr><td align="left"> Integrating <code class="code">std::string_view</code> and <code class="code">std::string</code> </td><td align="left"> 774 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0254r2.pdf" target="_top"> 775 P0254R2 776 </a> 777 </td><td align="center"> 7.1 </td><td align="left"><code class="code"> </code></td></tr><tr><td align="left"> Give 'std::string' a non-const '.data()' member function </td><td align="left"> 778 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0272r1.html" target="_top"> 779 P0272R1 780 </a> 781 </td><td align="center"> 7.1 </td><td align="left"><code class="code"> </code></td></tr><tr><td align="left">Cleaning-up noexcept in the Library</td><td align="left"> 782 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4258.pdf" target="_top"> 783 N4258 784 </a> 785 </td><td align="center">6.1</td><td align="left"><code class="code"> __cpp_lib_allocator_traits_is_always_equal >= 201411 </code></td></tr><tr><td align="left">Contiguous Iterators </td><td align="left"> 786 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4284.html" target="_top"> 787 N4284 788 </a> 789 </td><td align="center">N/A</td><td align="left"></td></tr><tr><td align="left"> Minimal incomplete type support for standard containers </td><td align="left"> 790 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4510.html" target="_top"> 791 N4510 792 </a> 793 </td><td align="center"> 3.0 </td><td align="left"><code class="code"> __cpp_lib_incomplete_container_elements >= 201505 </code> 794 (since 6.2, see Note 2) 795 </td></tr><tr><td align="left"> Emplace return type </td><td align="left"> 796 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0084r2.pdf" target="_top"> 797 P0084R2 798 </a> 799 </td><td align="center"> 7.1 </td><td align="left"></td></tr><tr><td align="left">Improved insertion interface for unique-key maps</td><td align="left"> 800 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4279.html" target="_top"> 801 N4279 802 </a> 803 </td><td align="center"> 6.1 </td><td align="left"><code class="code"> __cpp_lib_map_try_emplace >= 201411</code>, 804 <code class="code"> __cpp_lib_unordered_map_try_emplace >= 201411</code> 805 </td></tr><tr><td align="left"> Splicing Maps and Sets </td><td align="left"> 806 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0083r3.pdf" target="_top"> 807 P0083R3 808 </a> 809 </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_node_extract >= 201606 </code></td></tr><tr><td align="left">Non-member <code class="code">size()</code> and more</td><td align="left"> 810 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4280.pdf" target="_top"> 811 N4280 812 </a> 813 </td><td align="center"> 6.1 </td><td align="left"><code class="code"> __cpp_lib_nonmember_container_access >= 201411 </code></td></tr><tr><td align="left"> A Proposal to Add Constexpr Modifiers to <code class="code">reverse_iterator</code>, <code class="code">move_iterator</code>, <code class="code">array</code> and Range Access </td><td align="left"> 814 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0031r0.html" target="_top"> 815 P0031R0 816 </a> 817 </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_array_constexpr >= 201603 </code></td></tr><tr bgcolor="#B0B0B0"><td align="left"> The Parallelism TS Should be Standardized </td><td align="left"> 818 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0024r2.html" target="_top"> 819 P0024R2 820 </a> 821 </td><td align="center"> 9.1 </td><td align="left"><code class="code"> __has_include(<execution>)</code>, 822 <code class="code"> __cpp_lib_execution >= 201603 </code>, 823 <code class="code"> __cpp_lib_parallel_algorithm >= 201603 </code> 824 (requires linking with <code class="code">-ltbb</code>, see Note 3) 825 </td></tr><tr><td align="left"> An algorithm to "clamp" a value between a pair of boundary values </td><td align="left"> 826 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0025r0.html" target="_top"> 827 P0025R0 828 </a> 829 </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_clamp >= 201603 </code></td></tr><tr><td align="left"> Adopt Selected Library Fundamentals V2 Components for C++17 </td><td align="left"> 830 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0295r0.pdf" target="_top"> 831 P0295R0 832 </a> 833 </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_gcd_lcm >= 201606 </code></td></tr><tr><td align="left"> Proposal to Introduce a 3-Argument Overload to <code class="code">std::hypot</code> </td><td align="left"> 834 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0030r1.pdf" target="_top"> 835 P0030R1 836 </a> 837 </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_hypot >= 201603 </code></td></tr><tr><td align="left"> Mathematical Special Functions for C++17 </td><td align="left"> 838 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0226r1.pdf" target="_top"> 839 P0226R1 840 </a> 841 </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_math_special_functions >= 201603 </code> 842 (see Note 4) 843 </td></tr><tr><td align="left">Adopt the File System TS for C++17 </td><td align="left"> 844 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0218r1.html" target="_top"> 845 P0218R1 846 </a> 847 </td><td align="center"> 8.1 </td><td align="left"><code class="code"> __has_include(<filesystem>)</code>, 848 <code class="code"> __cpp_lib_filesystem >= 201603 </code> 849 (GCC 8.x requires linking with <code class="code">-lstdc++fs</code>) 850 </td></tr><tr><td align="left"> Relative Paths for Filesystem</td><td align="left"> 851 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0219r1.html" target="_top"> 852 P0219R1 853 </a> 854 </td><td align="center"> 8.1 </td><td align="left"><code class="code"> __cpp_lib_filesystem >= 201606 </code></td></tr><tr><td align="left"> Adapting string_view by filesystem paths </td><td align="left"> 855 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0392r0.pdf" target="_top"> 856 P0392R0 857 </a> 858 </td><td align="center"> 8.1 </td><td align="left"><code class="code"> __cpp_lib_filesystem >= 201606 </code></td></tr><tr><td align="left"> Directory Entry Caching for Filesystem </td><td align="left"> 859 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0317r1.html" target="_top"> 860 P0317R1 861 </a> 862 </td><td align="center"> 8.1 </td><td align="left"><code class="code"> __cpp_lib_filesystem >= 201703 </code></td></tr><tr><td align="left"> constexpr <code class="code">atomic<T>::is_always_lock_free</code> </td><td align="left"> 863 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0152r1.html" target="_top"> 864 P0152R1 865 </a> 866 </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_atomic_is_always_lock_free >= 201603 </code></td></tr><tr><td align="left">A proposal to add <code class="code">shared_mutex</code> (untimed) (Revision 4)</td><td align="left"> 867 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4508.html" target="_top"> 868 N4508 869 </a> 870 </td><td align="center"> 6.1 </td><td align="left"><code class="code"> __cpp_lib_shared_mutex >= 201505 </code></td></tr><tr><td align="left"> Variadic <code class="code">lock_guard</code> (Rev. 5) </td><td align="left"> 871 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0156r2.html" target="_top"> 872 P0156R2 873 </a> 874 </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_scoped_lock >= 201703 </code></td></tr><tr><td align="left"> A byte type definition </td><td align="left"> 875 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0298r3.pdf" target="_top"> 876 P0298R3 877 </a> 878 </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_byte >= 201603 </code> (since 7.3, see Note 2) 879 </td></tr><tr><td align="left"> Elementary string conversions </td><td align="left"> 880 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0067r5.html" target="_top"> 881 P0067R5 882 </a> 883 </td><td align="center"> 11.1 (integral types supported since 8.1) </td><td align="left"><code class="code"> __has_include(<charconv>)</code>, 884 <code class="code"> __cpp_lib_to_chars >= 201611 </code></td></tr><tr><td align="left"> Homogeneous interface for variant, any and optional </td><td align="left"> 885 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0032r3.pdf" target="_top"> 886 P0032R3 887 </a> 888 </td><td align="center"> 7.1 </td><td align="left"> 889 <code class="code"> __cpp_lib_any >= 201606 </code>, 890 <code class="code"> __cpp_lib_optional >= 201606 </code>, 891 <code class="code"> __cpp_lib_variant >= 201606 </code> 892 </td></tr><tr><td align="left"> Making Optional Greater Equal Again </td><td align="left"> 893 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0307r2.pdf" target="_top"> 894 P0307R2 895 </a> 896 </td><td align="center"> 7.1 </td><td align="left"> <code class="code"> __cpp_lib_optional >= 201606 </code> </td></tr></tbody></table></div></div><br class="table-break" /><p> 897 Note 1: This feature is supported in GCC 7.1 and 7.2 but before GCC 7.3 the 898 <code class="code">__cpp_lib</code> macro is not defined, and compilation will fail if the 899 header is included without using <code class="option">-std</code> to enable C++17 support. 900 </p><p> 901 Note 2: This feature is supported in older releases but the 902 <code class="code">__cpp_lib</code> macro is not defined to the right value 903 (or not defined at all) until the version shown in parentheses. 904 </p><p> 905 Note 3: The Parallel Algorithms have an external dependency on Intel TBB 2018 906 or later. If the <code class="filename"><execution></code> 907 header is included then <code class="code">-ltbb</code> must be used to link to TBB. 908 </p><p> 909 Note 4: The mathematical special functions are enabled in C++17 mode from 910 GCC 7.1 onwards. For GCC 6.x or for C++11/C++14 define 911 <code class="code">__STDCPP_WANT_MATH_SPEC_FUNCS__</code> to a non-zero value 912 and test for <code class="code">__STDCPP_MATH_SPEC_FUNCS__ >= 201003L</code>. 913 </p><p> 914 The following status table is based on the table of contents of 915 ISO/IEC 14882:2017. 916 Some subclauses are not shown in the table where the content is unchanged 917 since C++14 and the implementation is complete. 918 </p><div class="table"><a id="table.cxx17_status"></a><p class="title"><strong>Table1.6.C++ 2017 Implementation Status</strong></p><div class="table-contents"><table class="table" summary="C++ 2017 Implementation Status" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /></colgroup><thead><tr><th align="left">Section</th><th align="left">Description</th><th align="left">Status</th><th align="left">Comments</th></tr></thead><tbody><tr><td align="left"> 919 <span class="emphasis"><em>21</em></span> 920 </td><td colspan="3" align="left"> 921 <span class="emphasis"><em>Language support</em></span> 922 </td></tr><tr><td align="left">21.1</td><td align="left">General</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">21.2</td><td align="left">Common definitions</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">21.3</td><td align="left">Implementation properties</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">21.3.1</td><td align="left">General</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">21.3.2</td><td align="left">Header <code class="code"><limits></code> synopsis</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">21.3.3</td><td align="left">Floating-point type properties</td><td align="left"></td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">21.3.3.1</td><td align="left"><code class="code">float_round_style</code></td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">21.3.3.2</td><td align="left"><code class="code">float_denorm_style</code></td><td align="left">N</td><td align="left"></td></tr><tr><td align="left">21.3.4</td><td align="left">Class template <code class="code">numeric_limits</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">21.3.5</td><td align="left">Header <code class="code"><climits></code> synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">21.3.6</td><td align="left">Header <code class="code"><cfloat></code> synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">21.4</td><td align="left">Integer types</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">21.4.1</td><td align="left">Header <code class="code"><cstdint></code> synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr bgcolor="#B0B0B0"><td align="left">21.5</td><td align="left">Start and termination</td><td align="left">Partial</td><td align="left">C library dependency for quick_exit, at_quick_exit</td></tr><tr><td align="left">21.6</td><td align="left">Dynamic memory management</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">21.6.1</td><td align="left">Header <code class="code"><new></code> synopsis</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">21.6.2</td><td align="left">Storage allocation and deallocation</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">21.6.3</td><td align="left">Storage allocation errors</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">21.6.4</td><td align="left">Pointer optimization barrier</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">21.6.5</td><td align="left">Hardware interference size</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">21.7</td><td align="left">Type identification</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">21.8</td><td align="left">Exception handling</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">21.8.1</td><td align="left">Header <code class="code"><exception></code> synopsis</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">21.8.2</td><td align="left">Class exception</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">21.8.3</td><td align="left">Class bad_exception</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">21.8.4</td><td align="left">Abnormal termination</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">21.8.5</td><td align="left"><code class="code">uncaught_exceptions</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">21.8.6</td><td align="left">Exception Propagation</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">21.8.7</td><td align="left"><code class="code">nested_exception</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">21.9</td><td align="left">Initializer lists</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">21.10</td><td align="left">Other runtime support</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"> 923 <span class="emphasis"><em>22</em></span> 924 </td><td colspan="3" align="left"> 925 <span class="emphasis"><em>Diagnostics</em></span> 926 </td></tr><tr><td align="left">22.1</td><td align="left">General</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">22.2</td><td align="left">Exception classes</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.3</td><td align="left">Assertions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.4</td><td align="left">Error numbers</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">22.5</td><td align="left">System error support</td><td align="left"></td><td align="left"></td></tr><tr><td align="left"> 927 <span class="emphasis"><em>23</em></span> 928 </td><td colspan="3" align="left"> 929 <span class="emphasis"><em>General utilities</em></span> 930 </td></tr><tr><td align="left">23.1</td><td align="left">General</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">23.2</td><td align="left">Utility components</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">23.2.1</td><td align="left">Header <code class="code"><utility></code> synopsis</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">23.2.2</td><td align="left">Operators</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.2.3</td><td align="left"><code class="code">swap</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.2.4</td><td align="left"><code class="code">exchange</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.2.5</td><td align="left">Forward/move helpers</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.2.6</td><td align="left">Function template <code class="code">as_const</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.2.7</td><td align="left">Function template <code class="code">declval</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.2.8</td><td align="left">Primitive numeric output conversion</td><td align="left">Partial</td><td align="left"></td></tr><tr><td align="left">23.2.9</td><td align="left">Primitive numeric input conversion</td><td align="left">Partial</td><td align="left"></td></tr><tr><td align="left">23.3</td><td align="left">Compile-time integer sequences</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">23.4</td><td align="left">Pairs</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.5</td><td align="left">Tuples</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.6</td><td align="left">Optional objects</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.7</td><td align="left">Variants</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.8</td><td align="left">Storage for any type</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.9</td><td align="left">Bitsets</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.10</td><td align="left">Memory</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.10.1</td><td align="left">In general</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">23.10.2</td><td align="left">Header <code class="code"><memory></code> synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.10.3</td><td align="left">Pointer traits</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.10.4</td><td align="left">Pointer safety</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.10.5</td><td align="left">Align</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.10.6</td><td align="left">Allocator argument tag</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.10.7</td><td align="left"><code class="code">uses_allocator</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.10.8</td><td align="left">Allocator traits</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.10.9</td><td align="left">The default allocator</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.10.10</td><td align="left">Specialized algorithms</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.10.11</td><td align="left">C library memory allocation</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.11</td><td align="left">Smart pointers</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">23.11.1</td><td align="left">Class template <code class="code">unique_ptr</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.11.2</td><td align="left">Shared-ownership pointers</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.12</td><td align="left">Memory resources</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">23.12.1</td><td align="left">Header <code class="code"><memory_resource></code> synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.12.2</td><td align="left">Class <code class="code">memory_resource</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.12.3</td><td align="left">Class template <code class="code">polymorphic_allocator</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.12.4</td><td align="left">Access to program-wide <code class="code">memory_resource</code> objects</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.12.5</td><td align="left">Pool resource classes</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.12.6</td><td align="left">Class <code class="code">monotonic_buffer_resource</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.13</td><td align="left">Class template <code class="code">scoped_allocator_adaptor</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.14</td><td align="left">Function objects</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">23.14.1</td><td align="left">Header <code class="code"><functional></code> synopsis</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">23.14.2</td><td align="left">Definitions</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">23.14.3</td><td align="left">Requirements</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">23.14.4</td><td align="left">Function template <code class="code">invoke</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.14.5</td><td align="left">Class template <code class="code">reference_wrapper</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.14.6</td><td align="left">Arithmetic operation</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.14.7</td><td align="left">Comparisons</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.14.8</td><td align="left">Logical operations</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.14.9</td><td align="left">Bitwise operations</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.14.10</td><td align="left">Function template <code class="code">not_fn</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.14.11</td><td align="left">Function object binders</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.14.12</td><td align="left">Function template <code class="code">mem_fn</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.14.13</td><td align="left">Polymorphic function wrappers</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.14.14</td><td align="left">Searchers</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.14.15</td><td align="left">Class template <code class="code">hash</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.15</td><td align="left">Metaprogramming and type traits</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">23.15.1</td><td align="left">Requirements</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">23.15.2</td><td align="left">Header <code class="code"><type_traits></code> synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.15.3</td><td align="left">Helper classes</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.15.4</td><td align="left">Unary Type Traits</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.15.5</td><td align="left">Type property queries</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.15.6</td><td align="left">Relationships between types</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.15.7</td><td align="left">Transformations between types</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.15.8</td><td align="left">Logical operator traits</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.16</td><td align="left">Compile-time rational arithmetic</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.17.1</td><td align="left">In general</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">23.17.2</td><td align="left">Header <code class="code"><chrono></code> synopsis</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">23.17</td><td align="left">Time utilities</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">23.17.3</td><td align="left">Clock requirements</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.17.4</td><td align="left">Time-related traits</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.17.5</td><td align="left">Class template <code class="code">duration</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.17.6</td><td align="left">Class template <code class="code">time_point</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.17.7</td><td align="left">Clocks</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.17.8</td><td align="left">Header <code class="code"><ctime></code> synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.18</td><td align="left">Class <code class="code">type_index</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.19</td><td align="left">Execution policies</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">23.19.1</td><td align="left">In general</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">23.19.2</td><td align="left">Header <code class="code"><execution></code> synopsis</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">23.19.3</td><td align="left">Execution policy type trait</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.19.4</td><td align="left">Sequenced execution policy</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.19.5</td><td align="left">Parallel execution policy</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.19.6</td><td align="left">Parallel and unsequenced execution policy</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">23.19.7</td><td align="left">Execution policy objects</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"> 931 <span class="emphasis"><em>24</em></span> 932 </td><td colspan="3" align="left"> 933 <span class="emphasis"><em>Strings</em></span> 934 </td></tr><tr><td align="left">24.1</td><td align="left">General</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">24.2</td><td align="left">Character traits</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">24.3</td><td align="left">String classes</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">24.4</td><td align="left">String view classes</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">24.4.1</td><td align="left">Header <code class="code"><string_view></code> synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">24.4.2</td><td align="left">Class template <code class="code">basic_string_view</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">24.4.3</td><td align="left">Non-member comparison functions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">24.4.4</td><td align="left">Inserters and extractors</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">24.4.5</td><td align="left">Hash support</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">24.4.6</td><td align="left">Suffix for <code class="code">basic_string_view</code> literals</td><td align="left">Y</td><td align="left"></td></tr><tr bgcolor="#B0B0B0"><td align="left">24.5</td><td align="left">Null-terminated sequence utilities</td><td align="left">Partial</td><td align="left">C library dependency. </td></tr><tr><td align="left"> 935 <span class="emphasis"><em>25</em></span> 936 </td><td colspan="3" align="left"> 937 <span class="emphasis"><em>Localization</em></span> 938 </td></tr><tr><td align="left">25.1</td><td align="left">General</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">25.2</td><td align="left">Header <code class="code"><locale></code> synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">25.3</td><td align="left">Locales</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">25.4</td><td align="left">Standard <code class="code">locale</code> categories</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">25.5</td><td align="left">C Library Locales</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"> 939 <span class="emphasis"><em>26</em></span> 940 </td><td colspan="3" align="left"> 941 <span class="emphasis"><em>Containers</em></span> 942 </td></tr><tr><td align="left">26.1</td><td align="left">General</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">26.2</td><td align="left">Container requirements</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.3</td><td align="left">Sequence containers</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.4</td><td align="left">Associative containers</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.5</td><td align="left">Unordered associative containers</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">26.6</td><td align="left">Container adaptors</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"> 943 <span class="emphasis"><em>27</em></span> 944 </td><td colspan="3" align="left"> 945 <span class="emphasis"><em>Iterators</em></span> 946 </td></tr><tr><td align="left">27.1</td><td align="left">General</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">27.2</td><td align="left">Iterator requirements</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">27.3</td><td align="left">Header <code class="code"><iterator></code> synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">27.4</td><td align="left">Iterator primitives</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">27.5</td><td align="left">Iterator adaptors</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">27.6</td><td align="left">Stream iterators</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">27.7</td><td align="left">Range access</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">27.8</td><td align="left">Container access</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"> 947 <span class="emphasis"><em>28</em></span> 948 </td><td colspan="3" align="left"> 949 <span class="emphasis"><em>Algorithms</em></span> 950 </td></tr><tr><td align="left">28.1</td><td align="left">General</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">28.2</td><td align="left">Header <code class="code"><algorithm></code> synopsis</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">28.3</td><td align="left">Algorithms requirements</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">28.4</td><td align="left">Parallel algorithms</td><td align="left"></td><td align="left">Using <a class="link" href="https://github.com/llvm/llvm-project/tree/main/pstl" target="_top">PSTL</a></td></tr><tr><td align="left">28.5</td><td align="left">Non-modifying sequence operations</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">28.6</td><td align="left">Mutating sequence operations</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">28.7</td><td align="left">Sorting and related operations</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">28.8</td><td align="left">C library algorithms</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"> 951 <span class="emphasis"><em>29</em></span> 952 </td><td colspan="3" align="left"> 953 <span class="emphasis"><em>Numerics</em></span> 954 </td></tr><tr><td align="left">29.1</td><td align="left">General</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">29.2</td><td align="left">Definitions</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">29.3</td><td align="left">Numeric type requirements</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">29.4</td><td align="left">The floating-point environment</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">29.5</td><td align="left">Complex numbers</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">29.6</td><td align="left">Random number generation</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">29.7</td><td align="left">Numeric arrays</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">29.8</td><td align="left">Generalized numeric operations</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">29.8.1</td><td align="left">Header <code class="code"><numeric></code> synopsis</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">29.8.2</td><td align="left">Accumulate</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">29.8.3</td><td align="left">Reduce</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">29.8.4</td><td align="left">Inner product</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">29.8.5</td><td align="left">Transform reduce</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">29.8.6</td><td align="left">Partial sum</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">29.8.7</td><td align="left">Exclusive scan</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">29.8.8</td><td align="left">Inclusive scan</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">29.8.9</td><td align="left">Transform exclusive scan</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">29.8.10</td><td align="left">Transform inclusive scan</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">29.8.11</td><td align="left">Adjacent difference</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">29.8.12</td><td align="left">Iota</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">29.8.13</td><td align="left">Greatest common divisor</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">29.8.14</td><td align="left">Least common multiple</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">29.9</td><td align="left">Mathematical functions for floating-point types</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">29.9.1</td><td align="left">Header <code class="code"><cmath></code> synopsis</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">29.9.2</td><td align="left">Absolute values</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">29.9.3</td><td align="left">Three-dimensional hypotenuse</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">29.9.4</td><td align="left">Classification / comparison functions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">29.9.5</td><td align="left">Mathematical special functions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"> 955 <span class="emphasis"><em>30</em></span> 956 </td><td colspan="3" align="left"> 957 <span class="emphasis"><em>Input/output library</em></span> 958 </td></tr><tr><td align="left">30.1</td><td align="left">General</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.2</td><td align="left">Iostreams requirements</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.2.1</td><td align="left">Imbue Limitations</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.2.2</td><td align="left">Positioning Type Limitations</td><td align="left">Y</td><td align="left"></td></tr><tr bgcolor="#B0B0B0"><td align="left">30.2.3</td><td align="left">Thread safety</td><td align="left">Partial</td><td align="left"></td></tr><tr><td align="left">30.3</td><td align="left">Forward declarations</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.4</td><td align="left">Standard iostream objects</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.5</td><td align="left">Iostreams base classes</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.6</td><td align="left">Stream buffers</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.7</td><td align="left">Formatting and manipulators</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.8</td><td align="left">String-based streams</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.9</td><td align="left">File-based streams</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.10</td><td align="left">File systemss</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">30.11</td><td align="left">C library files</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"> 959 <span class="emphasis"><em>31</em></span> 960 </td><td colspan="3" align="left"> 961 <span class="emphasis"><em>Regular expressions</em></span> 962 </td></tr><tr><td align="left">31.1</td><td align="left">General</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">31.2</td><td align="left">Definitions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">31.3</td><td align="left">Requirements</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">31.4</td><td align="left">Header <code class="code"><regex></code> synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">31.5</td><td align="left">Namespace <code class="code">std::regex_constants</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">31.6</td><td align="left">Class <code class="code">regex_error</code></td><td align="left">Y</td><td align="left"></td></tr><tr bgcolor="#B0B0B0"><td align="left">31.7</td><td align="left">Class template <code class="code">regex_traits</code></td><td align="left">Partial</td><td align="left"><code class="code">transform_primary</code> is not correctly implemented</td></tr><tr><td align="left">31.8</td><td align="left">Class template <code class="code">basic_regex</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">31.9</td><td align="left">Class template <code class="code">sub_match</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">31.10</td><td align="left">Class template <code class="code">match_results</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">31.11</td><td align="left">Regular expression algorithms</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">31.12</td><td align="left">Regular expression Iterators</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">31.13</td><td align="left">Modified ECMAScript regular expression grammar</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"> 963 <span class="emphasis"><em>32</em></span> 964 </td><td colspan="3" align="left"> 965 <span class="emphasis"><em>Atomic operations</em></span> 966 </td></tr><tr><td align="left">32.1</td><td align="left">General</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">32.2</td><td align="left">Header <code class="code"><atomic></code> synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">32.3</td><td align="left">Type aliases</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">32.4</td><td align="left">Order and consistency</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">32.5</td><td align="left">Lock-free property</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">32.6</td><td align="left">Class template <code class="code"><atomic></code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">32.7</td><td align="left">Non-member functions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">32.8</td><td align="left">Flag Type and operations</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">32.9</td><td align="left">Fences</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"> 967 <span class="emphasis"><em>33</em></span> 968 </td><td colspan="3" align="left"> 969 <span class="emphasis"><em>Thread support</em></span> 970 </td></tr><tr><td align="left">33.1</td><td align="left">General</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">33.2</td><td align="left">Requirements</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">33.3</td><td align="left">Threads</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">33.3.1</td><td align="left">Header <code class="code">thread</code> synopsis</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">33.3.2</td><td align="left">Class <code class="code">thread</code></td><td align="left">Y</td><td align="left"></td></tr><tr bgcolor="#B0B0B0"><td align="left">33.3.2.1</td><td align="left">Class <code class="code">thread</code></td><td align="left">Partial</td><td align="left"><code class="code">thread::id</code> comparisons not well-defined</td></tr><tr><td align="left">33.3.3</td><td align="left">Namespace <code class="code">this_thread</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">33.4</td><td align="left">Mutual exclusion</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">33.4.3</td><td align="left">Mutex requirements</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">33.4.3.1</td><td align="left">In general</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">33.4.3.2</td><td align="left">Mutex types</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">33.4.3.2.1</td><td align="left">Class <code class="code">mutex</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">33.4.3.2.2</td><td align="left">Class <code class="code">recursive_mutex</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">33.4.3.3</td><td align="left">Timed mutex types</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">33.4.3.3.1</td><td align="left">Class <code class="code">timed_mutex</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">33.4.3.3.2</td><td align="left">Class <code class="code">recursive_timed_mutex</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">33.4.3.4</td><td align="left">Shared mutex types</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">33.4.3.4.1</td><td align="left">Class <code class="code">shared_mutex</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">33.4.3.5</td><td align="left">Shared timed mutex types</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">33.4.3.5.1</td><td align="left">Class <code class="code">shared_timed_mutex</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">33.4.4</td><td align="left">Locks</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">33.4.4.1</td><td align="left">Class template <code class="code">lock_guard</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">33.4.4.2</td><td align="left">Class template <code class="code">scoped_guard</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">33.4.4.3</td><td align="left">Class template <code class="code">unique_lock</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">33.4.4.4</td><td align="left">Class template <code class="code">shared_lock</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">33.4.5</td><td align="left">Generic locking algorithms</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">33.4.6</td><td align="left">Call once</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">33.4.6.1</td><td align="left">Struct <code class="code">once_flag</code></td><td align="left">Y</td><td align="left"></td></tr><tr bgcolor="#B0B0B0"><td align="left">33.4.6.2</td><td align="left">Function <code class="code">call_once</code></td><td align="left">Y</td><td align="left">Exception support is broken. 971 See <a class="link" href="https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66146" target="_top">PR 972 66146</a>. 973 </td></tr><tr><td align="left">33.5</td><td align="left">Condition variables</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">33.5.1</td><td align="left">Class <code class="code">condition_variable</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">33.5.2</td><td align="left">Class <code class="code">condition_variable_any</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">33.6</td><td align="left">Futures</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">33.6.1</td><td align="left">Overview</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">33.6.2</td><td align="left">Header <code class="code"><future></code></td><td align="left"></td><td align="left"></td></tr><tr><td align="left">33.6.3</td><td align="left">Error handling</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">33.6.4</td><td align="left">Class <code class="code">future_error</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">33.6.5</td><td align="left">Shared state</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">33.6.6</td><td align="left">Class template <code class="code">promise</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">33.6.7</td><td align="left">Class template <code class="code">future</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">33.6.8</td><td align="left">Class template <code class="code">shared_future</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">33.6.9</td><td align="left">Function template <code class="code">async</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">33.6.10</td><td align="left">Class template <code class="code">packaged_task</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"> 974 <span class="emphasis"><em>Appendix D</em></span> 975 </td><td colspan="3" align="left"> 976 <span class="emphasis"><em>Compatibility features</em></span> 977 </td></tr><tr><td align="left">D.4</td><td align="left">C++ standard library headers</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">D.4.1</td><td align="left">Header <code class="code"><ccomplex></code> synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">D.4.1</td><td align="left">Header <code class="code"><cstdalign></code> synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">D.4.1</td><td align="left">Header <code class="code"><cstdbool></code> synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">D.4.1</td><td align="left">Header <code class="code"><ctgmath></code> synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">D.5</td><td align="left">C standard library headers</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">D.6</td><td align="left"><code class="code">char*</code> streams</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">D.7</td><td align="left"><code class="code">uncaught_exception</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">D.8</td><td align="left">Old adaptable function bindings</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">D.9</td><td align="left">The default allocator</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">D.10</td><td align="left">Raw storage iterator</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">D.11</td><td align="left">Temporary buffers</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">D.12</td><td align="left">Deprecated type traits</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">D.13</td><td align="left">Deprecated iterator primitives</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">D.14</td><td align="left">Deprecated <code class="code">shared_ptr</code> observers</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">D.15</td><td align="left">Deprecated standard code conversion facets</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">D.16</td><td align="left">Deprecated convenience conversion interfaces</td><td align="left">Y</td><td align="left"></td></tr></tbody></table></div></div><br class="table-break" /><div class="table"><a id="table.cxx17_ts_status"></a><p class="title"><strong>Table1.7.C++ Technical Specifications Implementation Status</strong></p><div class="table-contents"><table class="table" summary="C++ Technical Specifications Implementation Status" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /></colgroup><thead><tr><th align="left">Paper</th><th align="left">Title</th><th align="left">Status</th><th align="left">Comments</th></tr></thead><tbody><tr><td align="left"> 978 <a class="link" href="https://www.open-std.org/JTC1/SC22/WG21/docs/papers/2014/n4076.html" target="_top"> 979 N4076 980 </a> 981 </td><td align="left">A generalized callable negator</td><td align="left">Y</td><td align="left">Library Fundamentals 2 TS</td></tr><tr><td align="left"> 982 <a class="link" href="https://www.open-std.org/JTC1/SC22/WG21/docs/papers/2014/n4273.htm" target="_top"> 983 N4273 984 </a> 985 </td><td align="left">Uniform Container Erasure</td><td align="left">Y</td><td align="left">Library Fundamentals 2 TS</td></tr><tr><td align="left"> 986 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4061.pdf" target="_top"> 987 N4061 988 </a> 989 </td><td align="left">Greatest Common Divisor and Least Common Multiple</td><td align="left">Y</td><td align="left">Library Fundamentals 2 TS</td></tr><tr><td align="left"> 990 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4066.htm" target="_top"> 991 N4066 992 </a> 993 </td><td align="left">Delimited iterators</td><td align="left">Y</td><td align="left">Library Fundamentals 2 TS</td></tr><tr><td align="left"> 994 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4282.pdf" target="_top"> 995 N4282 996 </a> 997 </td><td align="left">The World's Dumbest Smart Pointer</td><td align="left">Y</td><td align="left">Library Fundamentals 2 TS</td></tr><tr><td align="left"> 998 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4388.html" target="_top"> 999 N4388 1000 </a> 1001 </td><td align="left">Const-Propagating Wrapper</td><td align="left">Y</td><td align="left">Library Fundamentals 2 TS</td></tr><tr><td align="left"> 1002 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4391.html" target="_top"> 1003 N4391 1004 </a> 1005 </td><td align="left"> <code class="code">make_array</code>, revision 4 </td><td align="left">Y</td><td align="left">Library Fundamentals 2 TS</td></tr><tr><td align="left"> 1006 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4502.pdf" target="_top"> 1007 N4502 1008 </a> 1009 </td><td align="left"> Support for the C++ Detection Idiom, V2 </td><td align="left">Y</td><td align="left">Library Fundamentals 2 TS</td></tr><tr><td align="left"> 1010 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4519.pdf" target="_top"> 1011 N4519 1012 </a> 1013 </td><td align="left"> Source-Code Information Capture </td><td align="left">Y</td><td align="left">Library Fundamentals 2 TS</td></tr><tr bgcolor="#C8B0B0"><td align="left"> 1014 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4521.html" target="_top"> 1015 N4521 1016 </a> 1017 </td><td align="left"> Merge Fundamentals V1 into V2 </td><td align="left"> 1018 N (components from V1 are still in namespace 1019 <code class="code">fundamentals_v1</code>) 1020 </td><td align="left">Library Fundamentals 2 TS</td></tr><tr><td align="left"> 1021 <a class="link" href="https://www.open-std.org/JTC1/SC22/WG21/docs/papers/2015/p0013r1.html" target="_top"> 1022 P0013R1 1023 </a> 1024 </td><td align="left">Logical Operator Type Traits (revision 1)</td><td align="left">Y</td><td align="left">Library Fundamentals 2 TS</td></tr><tr><td align="left"> 1025 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4531.html" target="_top"> 1026 N4531 1027 </a> 1028 </td><td align="left">std::rand replacement, revision 3</td><td align="left">Y</td><td align="left">Library Fundamentals 2 TS</td></tr><tr><td align="left"> 1029 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0214r9.pdf" target="_top"> 1030 P0214R9 1031 </a> 1032 </td><td align="left">Data-Parallel Types</td><td align="left">Y</td><td align="left">Parallelism 2 TS</td></tr></tbody></table></div></div><br class="table-break" /><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="iso.2017.specific"></a>Implementation Specific Behavior</h4></div></div></div><p>For behaviour which is also specified by previous standards, 1033 see <a class="link" href="status.html#iso.1998.specific" title="Implementation Specific Behavior">C++ 1998/2003 Implementation 1034 Specific Behavior</a> and <a class="link" href="status.html#iso.2011.specific" title="Implementation Specific Behavior">C++ 1035 2011 Implementation Specific Behavior</a>. This section only 1036 documents behaviour which is new in the 2017 standard. 1037 </p><p> 1038 <span class="emphasis"><em>20.5.1.2 [headers]</em></span> 1039 Whether names from Annex K are declared by C++ headers depends on 1040 whether the underlying C library supports Annex K and declares the 1041 names. For the GNU C library, there is no Annex K support and so 1042 none of its names are declared by C++ headers. 1043 </p><p> 1044 <span class="emphasis"><em>23.6.5 [optional.bad_optional_access]</em></span> 1045 <code class="code">what()</code> returns <code class="literal">"bad optional access"</code>. 1046 </p><p> 1047 <span class="emphasis"><em>23.7.3 [variant.variant]</em></span> 1048 <code class="classname">variant</code> supports over-aligned types. 1049 </p><p> 1050 <span class="emphasis"><em>23.7.10 [variant.bad.access]</em></span> 1051 <code class="code">what()</code> returns one of the strings 1052 <code class="literal">"std::get: variant is valueless"</code>, 1053 <code class="literal">"std::get: wrong index for variant"</code>, 1054 <code class="literal">"std::visit: variant is valueless"</code>, 1055 or <code class="literal">"std::visit<R>: variant is valueless"</code>. 1056 </p><p> 1057 <span class="emphasis"><em>23.12.5.2 [memory.resource.pool.options]</em></span> 1058 Let S equal <code class="code">numeric_limits<size_t>::digits</code>. 1059 The limit for maximum number of blocks in a chunk is given by 1060 <span class="mathphrase">2<sup>N</sup>-1</span>, 1061 where N is <span class="mathphrase">min(19, 3 + S/2)</span>. 1062 The largest allocation size that will be allocated from a pool is 1063 <span class="mathphrase">2<sup>22</sup></span> 1064 when <span class="mathphrase">S > 20</span>, 1065 otherwise 3072 when <span class="mathphrase">S > 16</span>, 1066 otherwise 768. 1067 </p><p> 1068 <span class="emphasis"><em>23.12.6.1 [memory.resource.monotonic.buffer.ctor]</em></span> 1069 The default <code class="code">next_buffer_size</code> is <code class="code">128 * sizeof(void*)</code>. 1070 The default growth factor is <code class="code">1.5</code>. 1071 </p><p> 1072 <span class="emphasis"><em>23.15.4.3 [meta.unary.prop]</em></span> 1073 The predicate condition for 1074 <code class="code">has_unique_object_representations</code> is true for all scalar 1075 types except floating point types. 1076 </p><p> 1077 <span class="emphasis"><em>23.19.3 [execpol.type], 1078 28.4.3 [algorithms.parallel.exec]</em></span> 1079 There are no implementation-defined execution policies. 1080 </p><p> 1081 <span class="emphasis"><em>24.4.2 [string.view.template]</em></span> 1082 <code class="classname">basic_string_view<C, T>::iterator</code> is 1083 <code class="code">C*</code> and 1084 <code class="classname">basic_string_view<C, T>::const_iterator</code> is 1085 <code class="code">const C*</code>. 1086 </p><p> 1087 <span class="emphasis"><em>28.4.3 [algorithms.parallel.exec]</em></span> 1088 Threads of execution created by <code class="classname">std::thread</code> 1089 provide concurrent forward progress guarantees, so threads of execution 1090 implicitly created by the library will provide parallel forward 1091 progress guarantees. 1092 </p><p> 1093 <span class="emphasis"><em>29.4.1 [cfenv.syn]</em></span> 1094 The effects of the <code class="filename"><cfenv></code> functions 1095 depends on whether the <code class="code">FENV_ACCESS</code> pragma is supported, 1096 and on the C library that provides the header. 1097 </p><p> 1098 <span class="emphasis"><em>29.6.9 [c.math.rand]</em></span> 1099 Whether the <code class="function">rand</code> function may introduce data 1100 races depends on the target C library that provides the function. 1101 </p><p> 1102 <span class="emphasis"><em>29.9.5 [sf.cmath]</em></span> 1103 The effect of calling the mathematical special functions with large 1104 inputs should be documented here. 1105 </p><p> 1106 <span class="emphasis"><em>30.10.2.1 [fs.conform.9945]</em></span> 1107 The behavior of the filesystem library implementation will depend on 1108 the target operating system. Some features will not be supported 1109 on some targets. Symbolic links and file permissions 1110 are not supported on Windows. 1111 </p><p> 1112 <span class="emphasis"><em>30.10.5 [fs.filesystem.syn]</em></span> 1113 The clock used for file times is an unspecified type 1114 with a signed 64-bit representation, capable of representing 1115 timestamps with nanosecond resolution. The clock's epoch is 1116 unspecified, but is not the same as the system clock's epoch. 1117 </p><p> 1118 <span class="emphasis"><em>30.10.7.1 [fs.path.generic]</em></span> 1119 dot-dot in the root-directory refers to the root-directory itself. 1120 On Windows, a drive specifier such as <code class="code">"C:"</code> or 1121 <code class="code">"z:"</code> is treated as a root-name. On Cygwin, a path 1122 that begins with two successive directory separators is a 1123 root-name. Otherwise (for POSIX-like systems other than Cygwin), 1124 the implementation-defined root-name is an unspecified string 1125 which does not appear in any pathnames. 1126 </p><p> 1127 <span class="emphasis"><em>30.10.10.1 [fs.enum.path.format]</em></span> 1128 The character sequence is always interpreted in the native pathname 1129 format. 1130 </p><p> 1131 <span class="emphasis"><em>30.10.15.4 [fs.op.file_size]</em></span> 1132 If <code class="code">!is_regular_file(p)</code>, an error is reported. 1133 </p><p> 1134 <span class="emphasis"><em>30.10.15.32 [fs.op.rename]</em></span> 1135 On Windows, <code class="code">filesystem::rename</code> 1136 is implemented by calling <code class="code">MoveFileExW</code> and so 1137 does not meet the requirements of POSIX <code class="code">rename</code> 1138 when one or both of the paths resolves to an existing directory. 1139 Specifically, it is not possible to rename a directory to replace another 1140 directory (POSIX requires that to work if the directory being 1141 replaced is empty). 1142 </p><div class="section"><div class="titlepage"><div><div><h5 class="title"><a id="iso.2017.par2ts"></a>Parallelism 2 TS</h5></div></div></div><p> 1143 <span class="emphasis"><em>9.3 [parallel.simd.abi]</em></span> 1144 <code class="code">max_fixed_size<T></code> is 32, except when targetting 1145 AVX512BW and <code class="code">sizeof(T)</code> is 1. 1146 </p><p> 1147 When targeting 32-bit x86, 1148 <code class="classname">simd_abi::compatible<T></code> is an alias for 1149 <code class="classname">simd_abi::scalar</code>. 1150 When targeting 64-bit x86 (including x32) or Aarch64, 1151 <code class="classname">simd_abi::compatible<T></code> is an alias for 1152 <code class="classname">simd_abi::_VecBuiltin<16></code>, 1153 unless <code class="code">T</code> is <code class="code">long double</code>, in which case it is 1154 an alias for <code class="classname">simd_abi::scalar</code>. 1155 When targeting ARM (but not Aarch64) with NEON support, 1156 <code class="classname">simd_abi::compatible<T></code> is an alias for 1157 <code class="classname">simd_abi::_VecBuiltin<16></code>, 1158 unless <code class="code">sizeof(T) > 4</code>, in which case it is 1159 an alias for <code class="classname">simd_abi::scalar</code>. Additionally, 1160 <code class="classname">simd_abi::compatible<float></code> is an alias for 1161 <code class="classname">simd_abi::scalar</code> unless compiling with 1162 -ffast-math. 1163 </p><p> 1164 When targeting x86 (both 32-bit and 64-bit), 1165 <code class="classname">simd_abi::native<T></code> is an alias for one of 1166 <code class="classname">simd_abi::scalar</code>, 1167 <code class="classname">simd_abi::_VecBuiltin<16></code>, 1168 <code class="classname">simd_abi::_VecBuiltin<32></code>, or 1169 <code class="classname">simd_abi::_VecBltnBtmsk<64></code>, depending on 1170 <code class="code">T</code> and the machine options the compiler was invoked with. 1171 </p><p> 1172 When targeting ARM/Aarch64 or POWER, 1173 <code class="classname">simd_abi::native<T></code> is an alias for 1174 <code class="classname">simd_abi::scalar</code> or 1175 <code class="classname">simd_abi::_VecBuiltin<16></code>, depending on 1176 <code class="code">T</code> and the machine options the compiler was invoked with. 1177 </p><p> 1178 For any other targeted machine 1179 <code class="classname">simd_abi::compatible<T></code> and 1180 <code class="classname">simd_abi::native<T></code> are aliases for 1181 <code class="classname">simd_abi::scalar</code>. (subject to change) 1182 </p><p> 1183 The extended ABI tag types defined in the 1184 <code class="code">std::experimental::parallelism_v2::simd_abi</code> namespace are: 1185 <code class="classname">simd_abi::_VecBuiltin<Bytes></code>, and 1186 <code class="classname">simd_abi::_VecBltnBtmsk<Bytes></code>. 1187 </p><p> 1188 <code class="classname">simd_abi::deduce<T, N, Abis...>::type</code>, 1189 with <code class="code">N > 1</code> is an alias for an extended ABI tag, if a 1190 supported extended ABI tag exists. Otherwise it is an alias for 1191 <code class="classname">simd_abi::fixed_size<N></code>. The <code class="classname"> 1192 simd_abi::_VecBltnBtmsk</code> ABI tag is preferred over 1193 <code class="classname">simd_abi::_VecBuiltin</code>. 1194 </p><p> 1195 <span class="emphasis"><em>9.4 [parallel.simd.traits]</em></span> 1196 <code class="classname">memory_alignment<T, U>::value</code> is 1197 <code class="code">sizeof(U) * T::size()</code> rounded up to the next power-of-two 1198 value. 1199 </p><p> 1200 <span class="emphasis"><em>9.6.1 [parallel.simd.overview]</em></span> 1201 On ARM, <code class="classname">simd<T, _VecBuiltin<Bytes>></code> 1202 is supported if <code class="code">__ARM_NEON</code> is defined and 1203 <code class="code">sizeof(T) <= 4</code>. Additionally, 1204 <code class="code">sizeof(T) == 8</code> with integral <code class="code">T</code> is supported if 1205 <code class="code">__ARM_ARCH >= 8</code>, and <code class="code">double</code> is supported if 1206 <code class="code">__aarch64__</code> is defined. 1207 1208 On POWER, <code class="classname">simd<T, _VecBuiltin<Bytes>></code> 1209 is supported if <code class="code">__ALTIVEC__</code> is defined and <code class="code">sizeof(T) 1210 < 8</code>. Additionally, <code class="code">double</code> is supported if 1211 <code class="code">__VSX__</code> is defined, and any <code class="code">T</code> with <code class="code"> 1212 sizeof(T) <= 8</code> is supported if <code class="code">__POWER8_VECTOR__</code> 1213 is defined. 1214 1215 On x86, given an extended ABI tag <code class="code">Abi</code>, 1216 <code class="classname">simd<T, Abi></code> is supported according to the 1217 following table: 1218 </p><div class="table"><a id="table.par2ts_simd_support"></a><p class="title"><strong>Table1.8.Support for Extended ABI Tags</strong></p><div class="table-contents"><table class="table" summary="Support for Extended ABI Tags" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /></colgroup><thead><tr><th align="left">ABI tag <code class="code">Abi</code></th><th align="left">value type <code class="code">T</code></th><th align="left">values for <code class="code">Bytes</code></th><th align="left">required machine option</th></tr></thead><tbody><tr><td rowspan="6" align="left"> 1219 <code class="classname">_VecBuiltin<Bytes></code> 1220 </td><td rowspan="2" align="left"><code class="code">float</code></td><td align="left">8, 12, 16</td><td align="left">"-msse"</td></tr><tr><td align="left">20, 24, 28, 32</td><td align="left">"-mavx"</td></tr><tr><td rowspan="2" align="left"><code class="code">double</code></td><td align="left">16</td><td align="left">"-msse2"</td></tr><tr><td align="left">24, 32</td><td align="left">"-mavx"</td></tr><tr><td rowspan="2" align="left"> 1221 integral types other than <code class="code">bool</code> 1222 </td><td align="left"> 1223 <code class="code">Bytes</code> 16 and <code class="code">Bytes</code> divisible by 1224 <code class="code">sizeof(T)</code> 1225 </td><td align="left">"-msse2"</td></tr><tr><td align="left"> 1226 16 < <code class="code">Bytes</code> 32 and <code class="code">Bytes</code> 1227 divisible by <code class="code">sizeof(T)</code> 1228 </td><td align="left">"-mavx2"</td></tr><tr><td rowspan="2" align="left"> 1229 <code class="classname">_VecBuiltin<Bytes></code> and 1230 <code class="classname">_VecBltnBtmsk<Bytes></code> 1231 </td><td align="left"> 1232 vectorizable types with <code class="code">sizeof(T)</code> 4 1233 </td><td rowspan="2" align="left"> 1234 32 < <code class="code">Bytes</code> 64 and <code class="code">Bytes</code> 1235 divisible by <code class="code">sizeof(T)</code> 1236 </td><td align="left">"-mavx512f"</td></tr><tr><td align="left"> 1237 vectorizable types with <code class="code">sizeof(T)</code> < 4 1238 </td><td align="left">"-mavx512bw"</td></tr><tr><td rowspan="2" align="left"> 1239 <code class="classname">_VecBltnBtmsk<Bytes></code> 1240 </td><td align="left"> 1241 vectorizable types with <code class="code">sizeof(T)</code> 4 1242 </td><td rowspan="2" align="left"> 1243 <code class="code">Bytes</code> 32 and <code class="code">Bytes</code> divisible by 1244 <code class="code">sizeof(T)</code> 1245 </td><td align="left">"-mavx512vl"</td></tr><tr><td align="left"> 1246 vectorizable types with <code class="code">sizeof(T)</code> < 4 1247 </td><td align="left">"-mavx512bw" and "-mavx512vl"</td></tr></tbody></table></div></div><p><br class="table-break" /> 1248 </p></div></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="status.iso.2020"></a>C++ 2020</h3></div></div></div><p> 1249 In this implementation the <code class="literal">-std=gnu++20</code> or 1250 <code class="literal">-std=c++20</code> flag must be used to enable language 1251 and library 1252 features. See <a class="link" href="using.html#manual.intro.using.flags" title="Command Options">dialect</a> 1253 options. The pre-defined symbol 1254 <code class="constant">__cplusplus</code> is used to check for the 1255 presence of the required flag. 1256 </p><p> 1257 This section describes the C++20 and library TS support in 1258 the GCC 14 release series. 1259 </p><p> 1260 The following table lists new library features that are included in 1261 the C++20 standard. The "Proposal" column provides a link to the 1262 ISO C++ committee proposal that describes the feature, while the "Status" 1263 column indicates the first version of GCC that contains an implementation of 1264 this feature (if it has been implemented). 1265 A dash () in the status column indicates that the changes in the proposal 1266 either do not affect the code in libstdc++, or the changes are not required for conformance. 1267 The "SD-6 Feature Test / Notes" column shows the corresponding macro or header from 1268 <a class="link" href="https://isocpp.org/std/standing-documents/sd-6-sg10-feature-test-recommendations" target="_top">SD-6: 1269 Feature-testing recommendations for C++</a> (where applicable) 1270 or any notes about the implementation. 1271 </p><div class="table"><a id="table.cxx20_features"></a><p class="title"><strong>Table1.9.C++ 2020 Library Features</strong></p><div class="table-contents"><table class="table" summary="C++ 2020 Library Features" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /></colgroup><thead><tr><th align="left">Library Feature</th><th align="left">Proposal</th><th align="left">Status</th><th align="left">SD-6 Feature Test / Notes</th></tr></thead><tbody><tr><td colspan="4" align="left"> 1272 <span class="bold"><strong>Compile-time programming</strong></span> 1273 </td></tr><tr><td align="left"> Add constexpr modifiers to functions in <code class="code"><algorithm></code> and <code class="code"><utility></code> Headers </td><td align="left"> 1274 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0202r3.html" target="_top"> 1275 P0202R3 </a> 1276 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_constexpr_algorithms >= 201703L</code> </td></tr><tr><td align="left"> Constexpr for <code class="code">swap</code> and swap related functions </td><td align="left"> 1277 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0879r0.html" target="_top"> 1278 P0879R0 </a> 1279 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_constexpr_algorithms >= 201806L</code> </td></tr><tr><td align="left"> Constexpr for <code class="code">std::complex</code> </td><td align="left"> 1280 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0415r1.html" target="_top"> 1281 P0415R1 </a> 1282 </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_constexpr_complex >= 201711L</code> (since 9.4, see Note 1) </td></tr><tr><td align="left"> <code class="code">std::is_constant_evaluated()</code> </td><td align="left"> 1283 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0595r2.html" target="_top"> 1284 P0595R2 </a> 1285 </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_is_constant_evaluated >= 201811L</code> </td></tr><tr><td align="left"> More constexpr containers </td><td align="left"> 1286 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0784r7.html" target="_top"> 1287 P0784R7 </a> 1288 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_constexpr_dynamic_alloc >= 201907L</code> </td></tr><tr><td align="left"> Making <code class="code">std::string</code> constexpr </td><td align="left"> 1289 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0980r1.pdf" target="_top"> 1290 P0980R1 </a> 1291 </td><td align="center"> 12.1 </td><td align="left"> <code class="code">__cpp_lib_constexpr_string >= 201907L</code> </td></tr><tr><td align="left"> Making <code class="code">std::vector</code> constexpr </td><td align="left"> 1292 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1004r2.pdf" target="_top"> 1293 P1004R2 </a> 1294 </td><td align="center"> 12.1 </td><td align="left"> <code class="code">__cpp_lib_constexpr_vector >= 201907L</code> </td></tr><tr><td align="left"> Constexpr in <code class="code">std::pointer_traits</code> </td><td align="left"> 1295 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1006r1.pdf" target="_top"> 1296 P1006R1 </a> 1297 </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_constexpr_memory >= 201811L</code> (since 9.4, see Note 1) </td></tr><tr><td align="left"> constexpr for <code class="code"><numeric></code> algorithms </td><td align="left"> 1298 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1645r1.html" target="_top"> 1299 P1645R1 </a> 1300 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_constexpr_numeric >= 201911L</code> </td></tr><tr><td align="left"> Constexpr iterator requirements </td><td align="left"> 1301 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0858r0.html" target="_top"> 1302 P0858R0 </a> 1303 </td><td align="center"> 9.1 </td><td align="left"> 1304 <div class="informaltable"><table class="informaltable" border="0"><colgroup><col /></colgroup><tbody><tr><td> <code class="code">__cpp_lib_array_constexpr >= 201803L</code> </td></tr><tr><td> <code class="code">__cpp_lib_string_view >= 201803L</code> </td></tr><tr><td> (both since 9.4, see Note 1) </td></tr></tbody></table></div> 1305 </td></tr><tr><td align="left"> <code class="code">constexpr</code> comparison operators for <code class="code">std::array</code> </td><td align="left"> 1306 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1023r0.pdf" target="_top"> 1307 P1023R0 </a> 1308 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_array_constexpr >= 201806</code> </td></tr><tr><td align="left"> Misc constexpr bits </td><td align="left"> 1309 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1032r1.html" target="_top"> 1310 P1032R1 </a> 1311 </td><td align="center"> 10.1 </td><td align="left"> 1312 <div class="informaltable"><table class="informaltable" border="0"><colgroup><col /></colgroup><tbody><tr><td> <code class="code">__cpp_lib_array_constexpr >= 201811L</code> </td></tr><tr><td> <code class="code">__cpp_lib_constexpr_functional >= 201811L</code> </td></tr><tr><td> <code class="code">__cpp_lib_constexpr_iterator >= 201811L</code> </td></tr><tr><td> <code class="code">__cpp_lib_constexpr_string_view >= 201811L</code> </td></tr><tr><td> <code class="code">__cpp_lib_constexpr_tuple >= 201811L</code> </td></tr><tr><td> <code class="code">__cpp_lib_constexpr_utility >= 201811L</code> </td></tr></tbody></table></div> 1313 </td></tr><tr><td align="left"> <code class="code">constexpr <span class="emphasis"><em>INVOKE</em></span></code> </td><td align="left"> 1314 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1065r2.html" target="_top"> 1315 P1065R2 </a> 1316 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_constexpr_functional >= 201907L</code> </td></tr><tr><td align="left"> Transformation Trait <code class="code">remove_cvref</code> </td><td align="left"> 1317 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0550r2.pdf" target="_top"> 1318 P0550R2 </a> 1319 </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_remove_cvref >= 201711L</code> (since 9.4, see Note 1) </td></tr><tr><td align="left"> Implicit conversion traits and utility functions </td><td align="left"> 1320 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0758r1.html" target="_top"> 1321 P0758R1 </a> 1322 </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_is_nothrow_convertible >= 201806L</code> (since 9.4, see Note 1) </td></tr><tr><td align="left"> The <code class="code">identity</code> metafunction </td><td align="left"> 1323 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0887r1.pdf" target="_top"> 1324 P0887R1 </a> 1325 </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_type_identity >= 201806L</code> (since 9.4, see Note 1) </td></tr><tr><td align="left"> <code class="code">unwrap_ref_decay</code> and <code class="code">unwrap_reference</code> </td><td align="left"> 1326 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0318r1.pdf" target="_top"> 1327 P0318R1 </a> 1328 </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_unwrap_ref >= 201811L</code> (since 9.4, see Note 1) </td></tr><tr><td align="left"> Improving Completeness Requirements for Type Traits </td><td align="left"> 1329 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1285r0.pdf" target="_top"> 1330 P1285R0 </a> 1331 </td><td align="center"> </td><td align="left"> Most misuses are diagnosed, but not all. </td></tr><tr><td align="left"> Missing feature test macros </td><td align="left"> 1332 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1353r0.html" target="_top"> 1333 P1353R0 </a> 1334 </td><td align="center"> 9.1 </td><td align="left"></td></tr><tr><td align="left"> Making std::underlying_type SFINAE-friendly </td><td align="left"> 1335 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0340r3.html" target="_top"> 1336 P0340R3 </a> 1337 </td><td align="center"> 9.1 </td><td align="left"></td></tr><tr><td align="left"> Traits for [Un]bounded Arrays </td><td align="left"> 1338 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1357r1.pdf" target="_top"> 1339 P1357R1 </a> 1340 </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_bounded_array_traits >= 201902L</code> </td></tr><tr><td align="left"> Layout-compatibility and pointer-interconvertibility traits </td><td align="left"> 1341 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0466r5.pdf" target="_top"> 1342 P0466R5 </a> 1343 </td><td align="center"> 12.1 </td><td align="left"> 1344 <div class="informaltable"><table class="informaltable" border="0"><colgroup><col /></colgroup><tbody><tr><td> <code class="code">__cpp_lib_is_layout_compatible >= 201907L</code> </td></tr><tr><td> <code class="code">__cpp_lib_is_pointer_interconvertible >= 201907L</code> </td></tr></tbody></table></div> 1345 </td></tr><tr><td align="left"> Integrating feature-test macros into the C++ WD </td><td align="left"> 1346 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0941r2.html" target="_top"> 1347 P0941R2 </a> 1348 </td><td align="center"> 5.1 </td><td align="left"></td></tr><tr><td align="left"> <code class="code"><version></code> </td><td align="left"> 1349 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0754r2.pdf" target="_top"> 1350 P0754R2 </a> 1351 </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__has_include(<version>)</code> </td></tr><tr><td colspan="4" align="left"> 1352 <span class="bold"><strong>Synchronization</strong></span> 1353 </td></tr><tr><td align="left"> Atomic Ref </td><td align="left"> 1354 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0019r8.html" target="_top"> 1355 P0019R8 </a> 1356 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_atomic_ref >= 201806L</code> </td></tr><tr><td align="left"> Floating Point Atomic </td><td align="left"> 1357 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0020r6.html" target="_top"> 1358 P0020R6 </a> 1359 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_atomic_float >= 201711L</code> </td></tr><tr><td align="left"> C++ Synchronized Buffered Ostream </td><td align="left"> 1360 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0053r7.pdf" target="_top"> 1361 P0053R7 </a> 1362 </td><td align="center"> 11.1 </td><td align="left"> <code class="code">__cpp_lib_syncbuf >= 201711L</code> </td></tr><tr><td align="left"> Manipulators for C++ Synchronized Buffered Ostream </td><td align="left"> 1363 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0753r2.pdf" target="_top"> 1364 P0753R2 </a> 1365 </td><td align="center"> 11.1 </td><td align="left"> <code class="code">__cpp_lib_syncbuf >= 201803L</code> </td></tr><tr><td align="left"> Make <code class="code">std::memory_order</code> a scoped enumeration </td><td align="left"> 1366 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0439r0.html" target="_top"> 1367 P0439R0 </a> 1368 </td><td align="center"> 9.1 </td><td align="left"></td></tr><tr><td align="left"> The Curious Case of Padding Bits, Featuring Atomic Compare-and-Exchange </td><td align="left"> 1369 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0528r3.html" target="_top"> 1370 P0528R3 </a> 1371 </td><td align="center"> 13.1 </td><td align="left"></td></tr><tr><td align="left"> Atomic <code class="code">shared_ptr</code> </td><td align="left"> 1372 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0718r2.html" target="_top"> 1373 P0718R2 </a> 1374 </td><td align="center"> 12.1 </td><td align="left"> <code class="code"> __cpp_lib_atomic_shared_ptr >= 201711L</code> </td></tr><tr><td align="left"> std::stop_token and std::jthread </td><td align="left"> 1375 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0660r10.pdf" target="_top"> 1376 P0660R10 </a> 1377 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_jthread >= 201907L</code> </td></tr><tr><td align="left"> Rename <code class="code">condition_variable_any</code> interruptible wait methods </td><td align="left"> 1378 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1869r1.html" target="_top"> 1379 P1869R1 </a> 1380 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_jthread >= 201911L</code> </td></tr><tr><td align="left"> Atomic waiting and notifying, std::semaphore, std::latch and std::barrier </td><td align="left"> 1381 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1135r6.html" target="_top"> 1382 P1135R6 </a> 1383 </td><td align="center"> 11.1 </td><td align="left"> 1384 <div class="informaltable"><table class="informaltable" border="0"><colgroup><col /></colgroup><tbody><tr><td> <code class="code">__cpp_lib_atomic_lock_free_type_aliases >= 201907L</code> </td></tr><tr><td> <code class="code">__cpp_lib_atomic_flag_test >= 201907L</code> </td></tr><tr><td> <code class="code">__cpp_lib_atomic_wait >= 201907L</code> </td></tr><tr><td> <code class="code">__cpp_lib_semaphore >= 201907L</code> </td></tr><tr><td> <code class="code">__cpp_lib_latch >= 201907L</code> </td></tr><tr><td> <code class="code">__cpp_lib_barrier >= 201907L</code> </td></tr></tbody></table></div> 1385 </td></tr><tr><td align="left"> Fixing Atomic Initialization </td><td align="left"> 1386 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0883r2.pdf" target="_top"> 1387 P0883R2 </a> 1388 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_atomic_value_initialization >= 201911L</code> </td></tr><tr><td colspan="4" align="left"> 1389 <span class="bold"><strong>Ranges and Concepts</strong></span> 1390 </td></tr><tr><td align="left"> Standard Library Concepts </td><td align="left"> 1391 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0898r3.pdf" target="_top"> 1392 P0898R3 </a> 1393 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_concepts >= 201806L</code> </td></tr><tr><td align="left"> Rename concepts to standard_case for C++20, while we still can </td><td align="left"> 1394 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1754r1.pdf" target="_top"> 1395 P1754R1 </a> 1396 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_concepts >= 201907L</code> </td></tr><tr><td align="left"> Wording for <span class="emphasis"><em><code class="code">boolean-testable</code></em></span> </td><td align="left"> 1397 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2020/p1964r2.html" target="_top"> 1398 P1964R2 </a> 1399 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_concepts >= 202002L</code> </td></tr><tr><td align="left"> The One Ranges Proposal </td><td align="left"> 1400 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0896r4.pdf" target="_top"> 1401 P0896R4 </a> 1402 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_ranges >= 201811L</code> </td></tr><tr><td align="left"> Input Range Adaptors </td><td align="left"> 1403 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1035r7.pdf" target="_top"> 1404 P1035R7 </a> 1405 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_ranges >= 201907L</code> </td></tr><tr><td align="left"> <code class="code">ranges</code> compare algorithm are over-constrained </td><td align="left"> 1406 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1716r3.html" target="_top"> 1407 P1716R3 </a> 1408 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_ranges >= 201911L</code> </td></tr><tr><td align="left"> Remove CommonReference requirement from StrictWeakOrdering (a.k.a Fixing Relations) </td><td align="left"> 1409 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1248r1.html" target="_top"> 1410 P1248R1 </a> 1411 </td><td align="center"> 10.1 </td><td align="left"></td></tr><tr><td align="left"> Ranges Design Cleanup </td><td align="left"> 1412 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1252r2.pdf" target="_top"> 1413 P1252R2 </a> 1414 </td><td align="center"> 10.1 </td><td align="left"></td></tr><tr><td align="left"> Avoid template bloat for <code class="code">safe_ranges</code> in combination with subrange-y view adaptors.</td><td align="left"> 1415 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2020/p1739r4.html" target="_top"> 1416 P1739R4 </a> 1417 </td><td align="center"> 12.1 </td><td align="left"></td></tr><tr><td colspan="4" align="left"> 1418 <span class="bold"><strong>Time, dates, calendars, time zones</strong></span> 1419 </td></tr><tr><td align="left"> Extending chrono to Calendars and Time Zones </td><td align="left"> 1420 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0355r7.html" target="_top"> 1421 P0355R7 </a> 1422 </td><td align="left"> 14.1 (see Note 2) </td><td align="left"> <code class="code">__cpp_lib_chrono >= 201803L</code> </td></tr><tr><td align="left"> Miscellaneous minor fixes for chrono </td><td align="left"> 1423 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1466r3.html" target="_top"> 1424 P1466R3 </a> 1425 </td><td align="left"> 11.1 (see Note 2) </td><td align="left"> <code class="code">__cpp_lib_chrono >= 201907L</code> </td></tr><tr><td align="left"> <code class="code"><chrono></code> <code class="code">zero()</code>, <code class="code">min()</code>, and <code class="code">max()</code> should be <code class="code">noexcept</code> </td><td align="left"> 1426 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0972r0.pdf" target="_top"> 1427 P0972R0 </a> 1428 </td><td align="center"> 9.1 </td><td align="left"></td></tr><tr><td colspan="4" align="left"> 1429 <span class="bold"><strong>Three-way comparison</strong></span> 1430 </td></tr><tr><td align="left"> Library Support for the Spaceship (Comparison) Operator </td><td align="left"> 1431 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0768r1.pdf" target="_top"> 1432 P0768R1 </a> 1433 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_three_way_comparison >= 201711L</code> </td></tr><tr><td align="left"> Symmetry for spaceship </td><td align="left"> 1434 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0905r1.html" target="_top"> 1435 P0905R1 </a> 1436 </td><td align="center"> 10.1 </td><td align="left"></td></tr><tr><td align="left"> Adding <=> to the standard library </td><td align="left"> 1437 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1614r2.html" target="_top"> 1438 P1614R2 </a> 1439 </td><td align="center"> 10.1 </td><td align="left"> 1440 <code class="code">__cpp_lib_three_way_comparison >= 201907L</code> 1441 </td></tr><tr><td colspan="4" align="left"> 1442 <span class="bold"><strong>Strings and text</strong></span> 1443 </td></tr><tr><td align="left"> <code class="code">string::reserve</code> Should Not Shrink </td><td align="left"> 1444 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0966r1.html" target="_top"> 1445 P0966R1 </a> 1446 </td><td align="center"> 11.1 </td><td align="left"></td></tr><tr><td align="left"> <code class="code">char8_t</code>: A type for UTF-8 characters and strings </td><td align="left"> 1447 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0482r6.html" target="_top"> 1448 P0482R6 </a> 1449 </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_char8_t >= 201811L</code> </td></tr><tr><td align="left"> <code class="code">char8_t</code> backward compatibility remediation </td><td align="left"> 1450 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1423r3.html" target="_top"> 1451 P1423R3 </a> 1452 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_char8_t >= 201907L</code> </td></tr><tr><td align="left"> Text formatting </td><td align="left"> 1453 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0645r10.html" target="_top"> 1454 P0645R10 </a> 1455 </td><td align="center"> 13.1 </td><td align="left"> 1456 <code class="code">__cpp_lib_format >= 201907L</code> 1457 </td></tr><tr><td align="left"> Integration of chrono with text formatting </td><td align="left"> 1458 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1361r2.pdf" target="_top"> 1459 P1361R2 </a> 1460 </td><td align="center"> 13.1 </td><td align="left"> 1461 <code class="code">__cpp_lib_format >= 201907L</code> 1462 </td></tr><tr><td align="left"> Printf corner cases in <code class="code">std::format</code> </td><td align="left"> 1463 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1652r1.html" target="_top"> 1464 P1652R1 </a> 1465 </td><td align="center"> 13.1 </td><td align="left"> 1466 <code class="code">__cpp_lib_format >= 201907L</code> 1467 </td></tr><tr><td align="left"> String Prefix and Suffix Checking </td><td align="left"> 1468 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0457r2.html" target="_top"> 1469 P0457R2 </a> 1470 </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_starts_ends_with >= 201711L</code> (since 9.4, see Note 1) </td></tr><tr><td align="left"> Update The Reference To The Unicode Standard </td><td align="left"> 1471 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1025r1.html" target="_top"> 1472 P1025R1 </a> 1473 </td><td align="center"> </td><td align="left"></td></tr><tr><td colspan="4" align="left"> 1474 <span class="bold"><strong>Containers</strong></span> 1475 </td></tr><tr><td align="left"> span: bounds-safe views for sequences of objects </td><td align="left"> 1476 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0122r7.pdf" target="_top"> 1477 P0122R7 </a> 1478 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_span >= 201803L</code> </td></tr><tr><td align="left"> 1479 Usability Enhancements for <code class="classname">std::span</code> 1480 </td><td align="left"> 1481 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1024r3.pdf" target="_top"> 1482 P1024R3 </a> 1483 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_span >= 201902L</code> </td></tr><tr><td align="left"> Should Span be Regular? </td><td align="left"> 1484 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1085r2.md" target="_top"> 1485 P1085R2 </a> 1486 </td><td align="center"> 10.1 </td><td align="left"></td></tr><tr><td align="left"> Fixed-size <code class="code"><span></code> construction from dynamic range </td><td align="left"> 1487 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2020/p1976r2.html" target="_top"> 1488 P1976R2 </a> 1489 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_span >= 202002L</code> </td></tr><tr><td align="left"> <code class="code">std::to_array</code> </td><td align="left"> 1490 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0325r4.html" target="_top"> 1491 P0325R4 </a> 1492 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_to_array >= 201907L</code> </td></tr><tr><td align="left"> Checking for Existence of an Element in Associative Containers </td><td align="left"> 1493 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0458r2.html" target="_top"> 1494 P0458R2 </a> 1495 </td><td align="center"> 9.1 </td><td align="left"></td></tr><tr><td align="left"> Comparing Unordered Containers </td><td align="left"> 1496 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0809r0.pdf" target="_top"> 1497 P0809R0 </a> 1498 </td><td align="center"> </td><td align="left"></td></tr><tr><td align="left"> Heterogeneous lookup for unordered containers </td><td align="left"> 1499 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0919r3.html" target="_top"> 1500 P0919R3 </a> 1501 </td><td align="center"> 11.1 </td><td align="left"> <code class="code">__cpp_lib_generic_unordered_lookup >= 201811</code> </td></tr><tr><td align="left"> Refinement Proposal for P0919 </td><td align="left"> 1502 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1690r1.html" target="_top"> 1503 P1690R1 </a> 1504 </td><td align="center"> 11.1 </td><td align="left"></td></tr><tr><td align="left"> Adopt Consistent Container Erasure from Library Fundamentals 2 for C++20 </td><td align="left"> 1505 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1209r0.html" target="_top"> 1506 P1209R0 </a> 1507 </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_erase_if >= 201811L</code> </td></tr><tr><td align="left"> Improving the Return Value of Erase-Like Algorithms </td><td align="left"> 1508 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0646r1.pdf" target="_top"> 1509 P0646R1 </a> 1510 </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_list_remove_return_type >= 201806L</code> </td></tr><tr><td align="left"> Improving the Return Value of Erase-Like Algorithms II: Free <code class="code">erase</code>/<code class="code">erase_if</code> </td><td align="left"> 1511 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1115r3.pdf" target="_top"> 1512 P1115R3 </a> 1513 </td><td align="center"> 9.1 </td><td align="left"> 1514 <div class="informaltable"><table class="informaltable" border="0"><colgroup><col /></colgroup><tbody><tr><td> <code class="code">__cpp_lib_erase_if >= 202002L</code> </td></tr><tr><td> (defined to <code class="code">201900L</code> for GCC 9.1 and 9.2 so use <code class="code">> 201811L</code>) </td></tr></tbody></table></div> 1515 </td></tr><tr><td align="left"> Signed ssize() functions, unsigned size() functions </td><td align="left"> 1516 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1227r2.html" target="_top"> 1517 P1227R2 </a> 1518 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_ssize >= 201902L</code> </td></tr><tr><td colspan="4" align="left"> 1519 <span class="bold"><strong>Memory management</strong></span> 1520 </td></tr><tr><td align="left"> Utility to convert a pointer to a raw pointer </td><td align="left"> 1521 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0653r2.html" target="_top"> 1522 P0653R2 </a> 1523 </td><td align="center"> 8.1 </td><td align="left"> <code class="code">__cpp_lib_to_address >= 201711L</code> (since 9.4, see Note 1) </td></tr><tr><td align="left"> Extending <code class="code">make_shared</code> to Support Arrays </td><td align="left"> 1524 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0674r1.html" target="_top"> 1525 P0674R1 </a> 1526 </td><td align="center"> 12.1 </td><td align="left"> <code class="code">__cpp_lib_shared_ptr_arrays >= 201707L</code> </td></tr><tr><td align="left"> Efficient sized delete for variable sized classes </td><td align="left"> 1527 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0722r3.html" target="_top"> 1528 P0722R3 </a> 1529 </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_destroying_delete >= 201806L</code> </td></tr><tr><td align="left"> Utility functions to implement uses-allocator construction </td><td align="left"> 1530 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0591r4.pdf" target="_top"> 1531 P0591R4 </a> 1532 </td><td align="center"> 9.1 </td><td align="left"> 1533 <code class="code">std::scoped_allocator_adaptor</code> changes missing in 9.1.0 1534 </td></tr><tr><td align="left"> <code class="code">std::assume_aligned</code> </td><td align="left"> 1535 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1007r3.pdf" target="_top"> 1536 P1007R3 </a> 1537 </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_assume_aligned >= 201811L</code> (since 9.4, see Note 1) </td></tr><tr><td align="left"> Smart pointer creation with default initialization </td><td align="left"> 1538 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1020r1.html" target="_top"> 1539 P1020R1 </a> 1540 </td><td align="center"> 12.1 </td><td align="left"> <code class="code">__cpp_lib_smart_ptr_for_overwrite >= 201811L</code> </td></tr><tr><td align="left"> Rename "default_init" Functions </td><td align="left"> 1541 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2020/p1973r1.pdf" target="_top"> 1542 P1973R1 </a> 1543 </td><td align="center"> 12.1 </td><td align="left"> <code class="code">__cpp_lib_smart_ptr_for_overwrite >= 201811L</code> </td></tr><tr><td align="left"> Make stateful allocator propagation more consistent for <code class="code">operator+(basic_string)</code> </td><td align="left"> 1544 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1165r1.html" target="_top"> 1545 P1165R1 </a> 1546 </td><td align="center"> 10.1 </td><td align="left"></td></tr><tr><td align="left"> 1547 <code class="classname">polymorphic_allocator<></code> as a vocabulary type 1548 </td><td align="left"> 1549 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0339r6.pdf" target="_top"> 1550 P0339R6 </a> 1551 </td><td align="center"> 9.1 </td><td align="left"> 1552 <code class="code">__cpp_lib_polymorphic_allocator >= 201902L</code> (since 9.4, see Note 1) 1553 </td></tr><tr><td align="left"> LWG 2511: guaranteed copy elision for piecewise construction </td><td align="left"> 1554 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0475r1.html" target="_top"> 1555 P0475R1 </a> 1556 </td><td align="center"> 7.1 </td><td align="left"></td></tr><tr><td colspan="4" align="left"> 1557 <span class="bold"><strong>Miscellaneous</strong></span> 1558 </td></tr><tr><td align="left"> <code class="code">nodiscard</code> in the Library </td><td align="left"> 1559 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0600r1.pdf" target="_top"> 1560 P0600R1 </a> 1561 </td><td align="center"> 9.1 </td><td align="left"></td></tr><tr><td align="left"> de-pessimize legacy algorithms with <code class="code">std::move</code> </td><td align="left"> 1562 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0616r0.pdf" target="_top"> 1563 P0616R0 </a> 1564 </td><td align="center"> 9.1 </td><td align="left"></td></tr><tr><td align="left"> Deprecate POD </td><td align="left"> 1565 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0767r1.html" target="_top"> 1566 P0767R1 </a> 1567 </td><td align="center"> 10.1 </td><td align="left"></td></tr><tr><td align="left"> Treating Unnecessary <code class="code">decay</code> </td><td align="left"> 1568 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0777r1.pdf" target="_top"> 1569 P0777R1 </a> 1570 </td><td align="center"> 9.1 </td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left"> Thou Shalt Not Specialize std Function Templates! </td><td align="left"> 1571 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0551r3.pdf" target="_top"> 1572 P0551R3 </a> 1573 </td><td align="center"> </td><td align="left">These changes will not be implemented.</td></tr><tr><td align="left"> Bit-casting object representations </td><td align="left"> 1574 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0476r2.html" target="_top"> 1575 P0476R2 </a> 1576 </td><td align="center"> 11.1 </td><td align="left"> <code class="code">__cpp_lib_bit_cast >= 201806L</code> </td></tr><tr><td align="left"> Integral power-of-2 operations </td><td align="left"> 1577 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0556r3.html" target="_top"> 1578 P0556R3 </a> 1579 </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_int_pow2 >= 201806L</code> (since 9.4, see Note 1) </td></tr><tr><td align="left"> On the names of low-level bit manipulation functions </td><td align="left"> 1580 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2020/p1956r1.pdf" target="_top"> 1581 P1956R1 </a> 1582 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_int_pow2 >= 202002L</code> </td></tr><tr><td align="left"> Safe integral comparisons </td><td align="left"> 1583 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2020/p0586r2.html" target="_top"> 1584 P0586R2 </a> 1585 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_integer_comparison_functions >= 202002L</code> </td></tr><tr><td align="left"> Reviewing Deprecated Facilities of C++17 for C++20 </td><td align="left"> 1586 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0619r4.html" target="_top"> 1587 P0619R4 </a> 1588 </td><td align="center"> 12.1 </td><td align="left"></td></tr><tr><td align="left"> <code class="code">fpos</code> Requirements </td><td align="left"> 1589 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0759r1.html" target="_top"> 1590 P0759R1 </a> 1591 </td><td align="center"> </td><td align="left"></td></tr><tr><td align="left"> Add <code class="code">shift</code> to <code class="code"><algorithm></code> </td><td align="left"> 1592 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0769r2.pdf" target="_top"> 1593 P0769R2 </a> 1594 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_shift >= 201806L</code> </td></tr><tr><td align="left"> Standard Library Specification in a Concepts and Contracts World </td><td align="left"> 1595 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0788r3.pdf" target="_top"> 1596 P0788R3 </a> 1597 </td><td align="center"> </td><td align="left"></td></tr><tr><td align="left"> <code class="code">explicit(bool)</code> </td><td align="left"> 1598 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0892r2.html" target="_top"> 1599 P0892R2 </a> 1600 </td><td align="center"> </td><td align="left"></td></tr><tr><td align="left"> Eradicating unnecessarily explicit default constructors from the standard library </td><td align="left"> 1601 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0935r0.html" target="_top"> 1602 P0935R0 </a> 1603 </td><td align="center"> 9.1 </td><td align="left"></td></tr><tr><td align="left"> <code class="code">std::function</code> move constructor should be <code class="code">noexcept</code> </td><td align="left"> 1604 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0771r1.pdf" target="_top"> 1605 P0771R1 </a> 1606 </td><td align="center"> 7.2 </td><td align="left"></td></tr><tr><td align="left"> Simplified partial function application </td><td align="left"> 1607 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0356r5.html" target="_top"> 1608 P0356R5 </a> 1609 </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_bind_front >= 201811L</code> </td></tr><tr><td align="left"> <code class="code">bind_front</code> should not unwrap <code class="code">reference_wrapper</code> </td><td align="left"> 1610 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1651r0.html" target="_top"> 1611 P1651R0 </a> 1612 </td><td align="center"> 9.3 </td><td align="left"> <code class="code">__cpp_lib_bind_front >= 201907L</code> </td></tr><tr><td align="left"> <code class="code">reference_wrapper</code> for incomplete types </td><td align="left"> 1613 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0357r3.html" target="_top"> 1614 P0357R3 </a> 1615 </td><td align="center"> 9.1 </td><td align="left"></td></tr><tr><td align="left"> Fixing <code class="code">operator>>(basic_istream&, CharT*)</code> (LWG 2499) </td><td align="left"> 1616 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0487r1.html" target="_top"> 1617 P0487R1 </a> 1618 </td><td align="center"> 11.1 </td><td align="left"></td></tr><tr><td align="left"> <code class="code">variant</code> and <code class="code">optional</code> should propagate copy/move triviality </td><td align="left"> 1619 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0602r4.html" target="_top"> 1620 P0602R4 </a> 1621 </td><td align="center"> 8.3 </td><td align="left"></td></tr><tr><td align="left"> A sane <code class="code">variant</code> converting constructor </td><td align="left"> 1622 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0608r3.html" target="_top"> 1623 P0608R3 </a> 1624 </td><td align="center"> 10.1 </td><td align="left"></td></tr><tr><td align="left"> <code class="code">visit<R></code>: Explicit Return Type for <code class="code">visit</code> </td><td align="left"> 1625 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0655r1.pdf" target="_top"> 1626 P0655R1 </a> 1627 </td><td align="center"> 9.1 </td><td align="left"></td></tr><tr><td align="left"> P0899R1 - LWG 3016 is not a defect </td><td align="left"> 1628 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0899r1.html" target="_top"> 1629 P0899R1 </a> 1630 </td><td align="center"> 7.1 </td><td align="left"></td></tr><tr><td align="left"> Editorial Guidance for merging P0019r8 and P0528r3 </td><td align="left"> 1631 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1123r0.html" target="_top"> 1632 P1123R0 </a> 1633 </td><td align="center"> </td><td align="left"></td></tr><tr><td align="left"> Cleaning up Clause 20 </td><td align="left"> 1634 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1148r0.pdf" target="_top"> 1635 P1148R0 </a> 1636 </td><td align="center"> </td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left"> Completing the Rebase of Library Fundamentals, Version 3, Working Draft </td><td align="left"> 1637 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1210r0.html" target="_top"> 1638 P1210R0 </a> 1639 </td><td align="center"> </td><td align="left"></td></tr><tr><td align="left"> Alternative Wording for P0907R4 Signed Integers are Two's Complement </td><td align="left"> 1640 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1236r1.html" target="_top"> 1641 P1236R1 </a> 1642 </td><td align="center"> </td><td align="left"></td></tr><tr><td align="left"> 1643 I Stream, You Stream, We All Stream for 1644 <code class="classname">istream_iterator</code> 1645 </td><td align="left"> 1646 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0738r2.html" target="_top"> 1647 P0738R2 </a> 1648 </td><td align="center"> 10.1 </td><td align="left"></td></tr><tr><td align="left"> 1649 Mandating the Standard Library: 1650 Clause 16 - Language support library 1651 </td><td align="left"> 1652 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1458r1.pdf" target="_top"> 1653 P1458R1 </a> 1654 </td><td align="center"> </td><td align="left"></td></tr><tr><td align="left"> 1655 Mandating the Standard Library: 1656 Clause 18 - Diagnostics library 1657 </td><td align="left"> 1658 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1458r1.pdf" target="_top"> 1659 P1459R1 </a> 1660 </td><td align="center"> </td><td align="left"></td></tr><tr><td align="left"> 1661 Mandating the Standard Library: 1662 Clause 20 - Strings library 1663 </td><td align="left"> 1664 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1462r1.html" target="_top"> 1665 P1462R1 </a> 1666 </td><td align="center"> </td><td align="left"></td></tr><tr><td align="left"> 1667 Mandating the Standard Library: 1668 Clause 21 - Containers library 1669 </td><td align="left"> 1670 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1463r1.pdf" target="_top"> 1671 P1463R1 </a> 1672 </td><td align="center"> 10.1 </td><td align="left"></td></tr><tr><td align="left"> 1673 Mandating the Standard Library: 1674 Clause 22 - Iterators library 1675 </td><td align="left"> 1676 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1464r1.pdf" target="_top"> 1677 P1464R1 </a> 1678 </td><td align="center"> </td><td align="left"></td></tr><tr><td align="left"> Make <code class="code">create_directory()</code> Intuitive </td><td align="left"> 1679 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1164r1.pdf" target="_top"> 1680 P1164R1 1681 </a> 1682 </td><td align="center"> 8.3 </td><td align="left"> Treated as a DR for C++17 </td></tr><tr><td align="left"> 1683 Target Vectorization Policies from Parallelism V2 TS to C++20 1684 </td><td align="left"> 1685 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1001r2.html" target="_top"> 1686 P1001R2 </a> 1687 </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_execution >= 201902L</code> (since 9.4, see Note 1)</td></tr><tr><td align="left"> Merge Coroutines TS into C++20 working draft </td><td align="left"> 1688 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0912r5.html" target="_top"> 1689 P0912R5 </a> 1690 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_coroutines >= 201902L</code> </td></tr><tr><td align="left"> Endian just Endian </td><td align="left"> 1691 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0463r1.html" target="_top"> 1692 P0463R1 </a> 1693 </td><td align="center"> 8.1 </td><td align="left"> <code class="code">__cpp_lib_endian >= 201907L</code> </td></tr><tr><td align="left"> Bit operations </td><td align="left"> 1694 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0553r4.html" target="_top"> 1695 P0553R4 </a> 1696 </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_bitops >= 201907L</code> (since 9.4, see Note 1) </td></tr><tr><td align="left"> Well-behaved interpolation for numbers and pointers </td><td align="left"> 1697 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0811r3.html" target="_top"> 1698 P0811R3 </a> 1699 </td><td align="center"> 9.1 </td><td align="left"> <code class="code">__cpp_lib_interpolate >= 201902L</code> </td></tr><tr><td align="left"> Mathematical constants </td><td align="left"> 1700 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0631r8.pdf" target="_top"> 1701 P0631R8 </a> 1702 </td><td align="center"> 10.1 </td><td align="left"> <code class="code">__cpp_lib_math_constants >= 201907L</code> </td></tr><tr><td align="left"> std::source_location </td><td align="left"> 1703 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1208r6.pdf" target="_top"> 1704 P1208R6 </a> 1705 </td><td align="center"> 11.1 </td><td align="left"> 1706 <code class="code">__cpp_lib_source_location >= 201907L</code> 1707 </td></tr><tr><td align="left"> Efficient access to std::basic_stringbuf's Buffer </td><td align="left"> 1708 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0408r7.pdf" target="_top"> 1709 P0408R7 </a> 1710 </td><td align="center"> 11.1 </td><td align="left"></td></tr></tbody></table></div></div><br class="table-break" /><p> 1711 Note 1: This feature is supported in older releases but the 1712 <code class="code">__cpp_lib</code> macro is not defined to the right value 1713 (or not defined at all) until the version shown in parentheses. 1714 </p><p> 1715 Note 2: The C++20 calendar types are supported since 11.1, 1716 time zones and UTC are supported since 13.1, 1717 and <code class="function">chrono::parse</code> is supported since 14.1. 1718 </p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="status.iso.2023"></a>C++ 2023</h3></div></div></div><p> 1719 In this implementation the <code class="literal">-std=gnu++23</code> or 1720 <code class="literal">-std=c++23</code> flag must be used to enable language 1721 and library 1722 features. See <a class="link" href="using.html#manual.intro.using.flags" title="Command Options">dialect</a> 1723 options. The pre-defined symbol 1724 <code class="constant">__cplusplus</code> is used to check for the 1725 presence of the required flag. 1726 </p><p> 1727 This section describes the C++23 and library TS support in 1728 the GCC 14 release series. 1729 </p><p> 1730 The following table lists new library features that have been accepted into 1731 the C++23 working draft. The "Proposal" column provides a link to the 1732 ISO C++ committee proposal that describes the feature, while the "Status" 1733 column indicates the first version of GCC that contains an implementation of 1734 this feature (if it has been implemented). 1735 A dash () in the status column indicates that the changes in the proposal 1736 either do not affect the code in libstdc++, or the changes are not required for conformance. 1737 The "SD-6 Feature Test / Notes" column shows the corresponding macro or header from 1738 <a class="link" href="https://isocpp.org/std/standing-documents/sd-6-sg10-feature-test-recommendations" target="_top">SD-6: 1739 Feature-testing recommendations for C++</a> (where applicable) 1740 or any notes about the implementation. 1741 </p><div class="table"><a id="table.cxx23_features"></a><p class="title"><strong>Table1.10.C++ 2023 Library Features</strong></p><div class="table-contents"><table class="table" summary="C++ 2023 Library Features" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /></colgroup><thead><tr><th align="left">Library Feature</th><th align="left">Proposal</th><th align="left">Status</th><th align="left">SD-6 Feature Test / Notes</th></tr></thead><tbody><tr><td colspan="4" align="left"> 1742 <span class="bold"><strong>Ranges and Views</strong></span> 1743 </td></tr><tr><td align="left"> Range constructor for std::string_view </td><td align="left"> 1744 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p1989r2.pdf" target="_top"> 1745 P1989R2 1746 </a> 1747 </td><td align="center"> 11.1 </td><td align="left"></td></tr><tr><td align="left"> <code class="code">join_view</code> should join all views of ranges </td><td align="left"> 1748 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p2328r1.html" target="_top"> 1749 P2328R1 1750 </a> 1751 </td><td align="center"> 11.2 </td><td align="left"></td></tr><tr><td align="left"> Clarifying range adaptor objects </td><td align="left"> 1752 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p2281r1.html" target="_top"> 1753 P2281R1 1754 </a> 1755 </td><td align="center"> 11.1 </td><td align="left"></td></tr><tr><td align="left"> Views should not be required to be default constructible </td><td align="left"> 1756 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p2325r3.html" target="_top"> 1757 P2325R3 1758 </a> 1759 </td><td align="center"> 11.3 </td><td align="left"> <code class="code">__cpp_lib_ranges >= 202106L</code> </td></tr><tr><td align="left"> Conditionally borrowed ranges </td><td align="left"> 1760 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2020/p2017r1.html" target="_top"> 1761 P2017R1 1762 </a> 1763 </td><td align="center"> 11.1 </td><td align="left"></td></tr><tr><td align="left"> Require <code class="code">span</code> & <code class="code">basic_string_view</code> to be Trivially Copyable </td><td align="left"> 1764 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p2251r1.pdf" target="_top"> 1765 P2251R1 1766 </a> 1767 </td><td align="center"> Yes </td><td align="left"></td></tr><tr><td align="left"> Repairing input range adaptors and counted_iterator </td><td align="left"> 1768 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p2259r1.html" target="_top"> 1769 P2259R1 1770 </a> 1771 </td><td align="center"> 12.1 </td><td align="left"></td></tr><tr><td align="left"> Superior String Splitting </td><td align="left"> 1772 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p2210r2.html" target="_top"> 1773 P2210R2 1774 </a> 1775 </td><td align="center"> 12.1 </td><td align="left"></td></tr><tr><td align="left"> What is a <code class="code">view</code>? </td><td align="left"> 1776 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p2415r2.html" target="_top"> 1777 P2415R2 1778 </a> 1779 </td><td align="center"> 12.1 </td><td align="left"> <code class="code">__cpp_lib_ranges >= 202110L</code> </td></tr><tr><td align="left"> Fix istream_view </td><td align="left"> 1780 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p2432r1.pdf" target="_top"> 1781 P2432R1 1782 </a> 1783 </td><td align="center"> 12.1 </td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left"> <code class="code">starts_with</code> and <code class="code">ends_with</code> </td><td align="left"> 1784 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p1659r3.html" target="_top"> 1785 P1659R3 1786 </a> 1787 </td><td align="center"> </td><td align="left"> <code class="code">__cpp_lib_ranges_starts_ends_with >= 202106L</code> </td></tr><tr><td align="left"> <code class="code">zip</code> </td><td align="left"> 1788 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p2321r2.html" target="_top"> 1789 P2321R2 1790 </a> 1791 </td><td align="center"> 13.1 </td><td align="left"> <code class="code">__cpp_lib_ranges_zip >= 202110L</code> </td></tr><tr><td align="left"> <code class="code">views::repeat</code> </td><td align="left"> 1792 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p2474r2.html" target="_top"> 1793 P2474R2 1794 </a> 1795 </td><td align="center"> 13.1 </td><td align="left"> <code class="code">__cpp_lib_ranges_repeat >= 202207L</code> </td></tr><tr><td align="left"> <code class="code">views::enumerate</code> </td><td align="left"> 1796 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2023/p2164r9.pdf" target="_top"> 1797 P2164R9 1798 </a> 1799 </td><td align="center"> 13.1 </td><td align="left"> <code class="code">__cpp_lib_ranges_enumerate >= 202302L</code> </td></tr><tr><td align="left"> <code class="code">views::join_with</code> </td><td align="left"> 1800 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p2441r2.html" target="_top"> 1801 P2441R2 1802 </a> 1803 </td><td align="center"> 13.1 </td><td align="left"> <code class="code">__cpp_lib_ranges_join_with >= 202202L</code> </td></tr><tr><td align="left"> 1804 Windowing range adaptors: <code class="code">views::chunk</code> 1805 and <code class="code">views::slide</code> </td><td align="left"> 1806 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p2442r1.html" target="_top"> 1807 P2442R1 1808 </a> 1809 </td><td align="center"> 13.1 </td><td align="left"> <code class="code">__cpp_lib_ranges_slide >= 202202L</code> </td></tr><tr><td align="left"> <code class="code">views::chunk_by</code> </td><td align="left"> 1810 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p2443r1.html" target="_top"> 1811 P2443R1 1812 </a> 1813 </td><td align="center"> 13.1 </td><td align="left"> <code class="code">__cpp_lib_ranges_chunk_by >= 202202L</code> </td></tr><tr><td align="left"> <code class="code">views::stride</code> </td><td align="left"> 1814 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p1899r3.html" target="_top"> 1815 P1899R3 1816 </a> 1817 </td><td align="center"> 13.1 </td><td align="left"> <code class="code">__cpp_lib_ranges_stride >= 202207L</code> </td></tr><tr><td align="left"> <code class="code">views::cartesian_product</code> </td><td align="left"> 1818 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p2374r4.html" target="_top"> 1819 P2374R4 1820 </a> 1821 </td><td align="center"> 13.1 </td><td align="left"> <code class="code">__cpp_lib_ranges_cartesian_product >= 202207L</code> </td></tr><tr><td align="left"> Empty Product for certain Views </td><td align="left"> 1822 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p2540r1.html" target="_top"> 1823 P2540R1 1824 </a> 1825 </td><td align="center"> 13.1 </td><td align="left"> <code class="code">__cpp_lib_ranges_cartesian_product >= 202207L</code> </td></tr><tr><td align="left"> <code class="code">views::as_rvalue</code> </td><td align="left"> 1826 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p2446r2.html" target="_top"> 1827 P2446R2 1828 </a> 1829 </td><td align="center"> 13.1 </td><td align="left"> <code class="code">__cpp_lib_ranges_as_rvalue >= 202207L</code> </td></tr><tr><td align="left"> 1830 <code class="code">cbegin</code> should always return a constant iterator 1831 </td><td align="left"> 1832 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p2278r4.html" target="_top"> 1833 P2278R4 1834 </a> 1835 </td><td align="center"> 13.1 </td><td align="left"> <code class="code">__cpp_lib_ranges_as_const >= 202207L</code> </td></tr><tr bgcolor="#B0B0B0"><td align="left"> <code class="code">ranges::to</code> </td><td align="left"> 1836 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p1206r7.pdf" target="_top"> 1837 P1206R7 1838 </a> 1839 </td><td align="center"> 14.1 (<code class="code">ranges::to</code> function) </td><td align="left"> 1840 <code class="code">__cpp_lib_containers_ranges >= 202202L</code>, 1841 <code class="code">__cpp_lib_ranges_to_container >= 202202L</code> 1842 </td></tr><tr bgcolor="#C8B0B0"><td align="left"> Ranges iterators as inputs to non-Ranges algorithms </td><td align="left"> 1843 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p2408r5.html" target="_top"> 1844 P2408R5 1845 </a> 1846 </td><td align="center"> </td><td align="left"> 1847 <code class="code">__cpp_lib_algorithm_iterator_requirements >= 202207L</code> 1848 </td></tr><tr><td align="left"> Pipe support for user-defined range adaptors </td><td align="left"> 1849 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p2387r3.html" target="_top"> 1850 P2387R3 1851 </a> 1852 </td><td align="center"> 13.1 </td><td align="left"> 1853 <code class="code">__cpp_lib_bind_pack >= 202202L</code>, 1854 <code class="code">__cpp_lib_ranges >= 202202L</code> 1855 </td></tr><tr bgcolor="#B0B0B0"><td align="left"> 1856 <code class="code">ranges::iota</code>, <code class="code">ranges::shift_left</code>, 1857 and <code class="code">ranges::shift_right</code> 1858 </td><td align="left"> 1859 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p2440r1.html" target="_top"> 1860 P2440R1 1861 </a> 1862 </td><td align="center"> 13.1 (<code class="code">ranges::iota</code>) </td><td align="left"> 1863 <code class="code">__cpp_lib_ranges_iota >= 202202L</code>, 1864 <code class="code">__cpp_lib_shift >= 202202L</code> 1865 </td></tr><tr><td align="left"> <code class="code">ranges::find_last</code> </td><td align="left"> 1866 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p1223r5.pdf" target="_top"> 1867 P1223R5 1868 </a> 1869 </td><td align="center"> 13.1 </td><td align="left"> <code class="code">__cpp_lib_ranges_find_last >= 202207L</code> </td></tr><tr><td align="left"> <code class="code">ranges::contains</code> </td><td align="left"> 1870 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p2302r4.html" target="_top"> 1871 P2302R4 1872 </a> 1873 </td><td align="center"> 13.1 </td><td align="left"> <code class="code">__cpp_lib_ranges_contains >= 202207L</code> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> Making multi-param constructors of views explicit </td><td align="left"> 1874 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p2711r1.html" target="_top"> 1875 P2711R1 1876 </a> 1877 </td><td align="center"> </td><td align="left"></td></tr><tr><td align="left"> <code class="code">ranges::fold</code> </td><td align="left"> 1878 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p2322r6.html" target="_top"> 1879 P2322R6 1880 </a> 1881 </td><td align="center"> 13.1 </td><td align="left"> <code class="code">__cpp_lib_ranges_fold >= 202207L</code> </td></tr><tr><td align="left"> Relaxing Ranges Just A Smidge</td><td align="left"> 1882 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2023/p2609r3.html" target="_top"> 1883 P2609R3 1884 </a> 1885 </td><td align="center"> 14.3 </td><td align="left"> <code class="code">__cpp_lib_ranges >= 202302L</code> </td></tr><tr><td colspan="4" align="left"> 1886 <span class="bold"><strong>Compile-time programming</strong></span> 1887 </td></tr><tr><td align="left"> A proposal for a type trait to detect scoped enumerations </td><td align="left"> 1888 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2020/p1048r1.pdf" target="_top"> 1889 P1048R1 1890 </a> 1891 </td><td align="center"> 11.1 </td><td align="left"> <code class="code">__cpp_lib_is_scoped_enum >= 202011L</code> </td></tr><tr><td align="left"> std::to_underlying for enumerations </td><td align="left"> 1892 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p1682r3.html" target="_top"> 1893 P1682R3 1894 </a> 1895 </td><td align="center"> 11.1 </td><td align="left"> <code class="code">__cpp_lib_to_underlying >= 202102L</code> </td></tr><tr><td align="left"> Missing constexpr in std::optional and std::variant </td><td align="left"> 1896 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p2231r1.html" target="_top"> 1897 P2231R1 1898 </a> 1899 </td><td align="center"> 1900 <div class="informaltable"><table class="informaltable" border="0"><colgroup><col /></colgroup><tbody><tr><td> 11.3 (<code class="code">optional</code>) </td></tr><tr><td> 12.1 (<code class="code">variant</code>) </td></tr></tbody></table></div> 1901 </td><td align="left"> 1902 <div class="informaltable"><table class="informaltable" border="0"><colgroup><col /></colgroup><tbody><tr><td> <code class="code">__cpp_lib_constexpr_optional >= 202106L</code> </td></tr><tr><td> <code class="code">__cpp_lib_variant >= 202106L</code> </td></tr></tbody></table></div> 1903 </td></tr><tr><td align="left"> Making <code class="code">std::unique_ptr</code> constexpr </td><td align="left"> 1904 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p2273r3.pdf" target="_top"> 1905 P2273R3 1906 </a> 1907 </td><td align="center"> 12.1 </td><td align="left"> <code class="code">__cpp_lib_constexpr_memory >= 202202L</code> </td></tr><tr><td align="left"> Making <code class="code">std::type_info::operator==</code> constexpr </td><td align="left"> 1908 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p1328r1.html" target="_top"> 1909 P1328R1 1910 </a> 1911 </td><td align="center"> 12.1 </td><td align="left"> <code class="code">__cpp_lib_constexpr_typeinfo >= 202106L</code> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> constexpr for <code class="code"><cmath></code> and <code class="code"><cstdlib></code> </td><td align="left"> 1912 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p0533r9.pdf" target="_top"> 1913 P0533R9 1914 </a> 1915 </td><td align="center"> </td><td align="left"> <code class="code">__cpp_lib_constexpr_cmath >= 202202L</code> </td></tr><tr><td align="left"> Deprecate std::aligned_storage and std::aligned_union </td><td align="left"> 1916 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p1413r3.pdf" target="_top"> 1917 P1413R3 1918 </a> 1919 </td><td align="center"> 13.1 </td><td align="left"></td></tr><tr><td align="left"> A type trait to detect reference binding to temporary </td><td align="left"> 1920 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p2255r2.html" target="_top"> 1921 P2255R2 1922 </a> 1923 </td><td align="center"> 1924 <div class="informaltable"><table class="informaltable" border="0"><colgroup><col /></colgroup><tbody><tr><td> 13.1 (missing changes to <code class="code">std::tuple</code>) </td></tr><tr><td> 14.1 (complete) </td></tr></tbody></table></div> 1925 </td><td align="left"> <code class="code">__cpp_lib_reference_from_temporary >= 202202L</code> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> 1926 Move-only types for equality_comparable_with, totally_ordered_with, 1927 and three_way_comparable_with 1928 </td><td align="left"> 1929 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p2404r3.pdf" target="_top"> 1930 P2404R3 1931 </a> 1932 </td><td align="center"> </td><td align="left"> <code class="code">__cpp_lib_concepts >= 202207L</code> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> A trait for implicit lifetime types </td><td align="left"> 1933 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p2674r1.pdf" target="_top"> 1934 P2674R1 1935 </a> 1936 </td><td align="center"> </td><td align="left"> <code class="code">__cpp_lib_is_implicit_lifetime >= 202302L</code> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> 1937 <code class="code">common_reference_t</code> of <code class="code">reference_wrapper</code> 1938 Should Be a Reference Type 1939 </td><td align="left"> 1940 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2023/p2655r3.html" target="_top"> 1941 P2655R3 1942 </a> 1943 </td><td align="center"> </td><td align="left"> <code class="code">__cpp_lib_common_reference >= 202302L</code> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> Deprecate <code class="code">numeric_limits::has_denorm</code> </td><td align="left"> 1944 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p2614r2.pdf" target="_top"> 1945 P2614R2 1946 </a> 1947 </td><td align="center"> </td><td align="left"></td></tr><tr><td colspan="4" align="left"> 1948 <span class="bold"><strong>Containers</strong></span> 1949 </td></tr><tr><td align="left"> Iterator pair constructors for stack and queue </td><td align="left"> 1950 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p1425r4.pdf" target="_top"> 1951 P1425R4 1952 </a> 1953 </td><td align="center"> 12.1 </td><td align="left"> <code class="code">__cpp_lib_adaptor_iterator_pair_constructor >= 202106L</code> </td></tr><tr><td align="left"> Stop overconstraining allocators in container deduction guides </td><td align="left"> 1954 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p1518r2.html" target="_top"> 1955 P1518R2 1956 </a> 1957 </td><td align="center"> 12.1 </td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left"> Heterogeneous erasure overloads for associative containers </td><td align="left"> 1958 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p2077r3.html" target="_top"> 1959 P2077R3 1960 </a> 1961 </td><td align="center"> </td><td align="left"> <code class="code">__cpp_lib_associative_heterogeneous_erasure >= 202110L</code> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> <code class="code"><flat_map></code> </td><td align="left"> 1962 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p0429r9.pdf" target="_top"> 1963 P0429R9 1964 </a> 1965 </td><td align="center"> </td><td align="left"> <code class="code">__cpp_lib_flat_map >= 202207L</code> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> <code class="code"><flat_set></code> </td><td align="left"> 1966 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p1222r4.pdf" target="_top"> 1967 P1222R4 1968 </a> 1969 </td><td align="center"> </td><td align="left"> <code class="code">__cpp_lib_flat_set >= 202207L</code> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> <code class="code">mdspan</code> </td><td align="left"> 1970 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p0009r18.html" target="_top"> 1971 P0009R18 1972 </a> 1973 </td><td align="center"> </td><td align="left"> <code class="code">__cpp_lib_mdspan >= 202207L</code> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> 1974 <code class="code">index_type</code> & <code class="code">size_type</code> 1975 in <code class="code">mdspan</code> 1976 </td><td align="left"> 1977 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p2599r2.pdf" target="_top"> 1978 P2599R2 1979 </a> 1980 </td><td align="center"> </td><td align="left"> <code class="code">__cpp_lib_mdspan >= 202207L</code> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> 1981 <code class="code">mdspan</code>: rename <code class="code">pointer</code> and 1982 <code class="code">contiguous</code> 1983 </td><td align="left"> 1984 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p2604r0.html" target="_top"> 1985 P2604R0 1986 </a> 1987 </td><td align="center"> </td><td align="left"> <code class="code">__cpp_lib_mdspan >= 202207L</code> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> Add the missing <code class="code">empty</code> to <code class="code">mdspan</code> </td><td align="left"> 1988 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p2613r1.html" target="_top"> 1989 P2613R1 1990 </a> 1991 </td><td align="center"> </td><td align="left"> <code class="code">__cpp_lib_mdspan >= 202207L</code> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> 1992 <code class="code">layout_stride</code> static extents default constructor fix 1993 </td><td align="left"> 1994 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2023/p2763r1.html" target="_top"> 1995 P2763R1 1996 </a> 1997 </td><td align="center"> </td><td align="left"></td></tr><tr><td colspan="4" align="left"> 1998 <span class="bold"><strong>Strings and text</strong></span> 1999 </td></tr><tr><td align="left"> string contains function </td><td align="left"> 2000 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2020/p1679r3.html" target="_top"> 2001 P1679R3 2002 </a> 2003 </td><td align="center"> 11.1 </td><td align="left"> <code class="code">__cpp_lib_string_contains >= 202011L</code> </td></tr><tr><td align="left"> Prohibit std::basic_string and std::basic_string_view construction from nullptr </td><td align="left"> 2004 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2020/p2166r1.html" target="_top"> 2005 P2166R1 2006 </a> 2007 </td><td align="center"> 12.1 </td><td align="left"></td></tr><tr><td align="left"> basic_string::resize_and_overwrite </td><td align="left"> 2008 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p1072r10.html" target="_top"> 2009 P1072R10 2010 </a> 2011 </td><td align="center"> 12.1 </td><td align="left"> <code class="code">__cpp_lib_resize_and_overwrite >= 202110L</code> </td></tr><tr><td align="left"> A strstream replacement using span<charT> as buffer </td><td align="left"> 2012 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p0448r4.pdf" target="_top"> 2013 P0448R4 2014 </a> 2015 </td><td align="center"> 12.1 </td><td align="left"> <code class="code">__cpp_lib_spanstream >= 202106L</code> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> <code class="code"> std::string::substr() && </code> </td><td align="left"> 2016 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p2438r2.html" target="_top"> 2017 P2438R2 2018 </a> 2019 </td><td align="center"> </td><td align="left"></td></tr><tr><td align="left"> std::format improvements </td><td align="left"> 2020 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p2216r3.html" target="_top"> 2021 P2216R3 2022 </a> 2023 </td><td align="center"> 13.1 </td><td align="left"> <code class="code">__cpp_lib_format >= 202106L</code> </td></tr><tr><td align="left"> 2024 Add support for <code class="code">std::generator</code>-like types to 2025 <code class="code">std::format</code> 2026 </td><td align="left"> 2027 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p2418r2.html" target="_top"> 2028 P2418R2 2029 </a> 2030 </td><td align="center"> 13.1 </td><td align="left"> <code class="code">__cpp_lib_format >= 202110L</code> </td></tr><tr><td align="left"> 2031 Expose <code class="code">std::<span class="emphasis"><em>basic-format-string</em></span><charT, Args...></code> 2032 </td><td align="left"> 2033 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p2508r1.html" target="_top"> 2034 P2508R1 2035 </a> 2036 </td><td align="center"> 13.1 (feature test macro not updated)</td><td align="left"> <code class="code">__cpp_lib_format >= 202207L</code> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> 2037 Clarify handling of encodings in localized formatting of chrono types 2038 </td><td align="left"> 2039 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p2419r2.html" target="_top"> 2040 P2419R2 2041 </a> 2042 </td><td align="center"> </td><td align="left"> <code class="code">__cpp_lib_format >= 202207L</code> </td></tr><tr><td align="left"> 2043 Formatting pointers 2044 </td><td align="left"> 2045 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p2510r3.pdf" target="_top"> 2046 P2510R3 2047 </a> 2048 </td><td align="center"> 13.2 (feature test macro not defined)</td><td align="left"> <code class="code">__cpp_lib_format >= 202207L</code> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> Formatting Ranges </td><td align="left"> 2049 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p2286r8.html" target="_top"> 2050 P2286R8 2051 </a> 2052 </td><td align="center"> </td><td align="left"> <code class="code">__cpp_lib_format_ranges >= 202207L</code> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> Improve default container formatting </td><td align="left"> 2053 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p2585r1.html" target="_top"> 2054 P2585R1 2055 </a> 2056 </td><td align="center"> </td><td align="left"> <code class="code">__cpp_lib_format_ranges >= 202207L</code> </td></tr><tr><td align="left"> Formatted output </td><td align="left"> 2057 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p2093r14.html" target="_top"> 2058 P2093R14 2059 </a> 2060 </td><td align="center"> 14.1 </td><td align="left"> <code class="code">__cpp_lib_print >= 202207L</code> </td></tr><tr><td align="left"> 2061 Should the output of std::print to a terminal be synchronized with 2062 the underlying stream? 2063 </td><td align="left"> 2064 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p2539r3.html" target="_top"> 2065 P2539R3 2066 </a> 2067 </td><td align="center"> 14.1 </td><td align="left"></td></tr><tr><td align="left"> 2068 Formatting <code class="code">thread::id</code> and <code class="code">stacktrace</code> 2069 </td><td align="left"> 2070 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2023/p2693r1.pdf" target="_top"> 2071 P2693R1 2072 </a> 2073 </td><td align="center"> 14.1 </td><td align="left"> <code class="code">__cpp_lib_formatters >= 202302L</code> </td></tr><tr><td align="left"> 2074 Add Constexpr Modifiers to Functions <code class="code">to_chars</code> and 2075 <code class="code">from_chars</code> for Integral Types in 2076 <code class="code"><charconv></code> Header 2077 </td><td align="left"> 2078 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p2291r3.pdf" target="_top"> 2079 P2291R3 2080 </a> 2081 </td><td align="center"> 13.1 </td><td align="left"> <code class="code">__cpp_lib_constexpr_charconv >= 202207L</code> </td></tr><tr><td colspan="4" align="left"> 2082 <span class="bold"><strong>Miscellaneous</strong></span> 2083 </td></tr><tr><td align="left"> Inheriting from <code class="code">std::variant</code> </td><td align="left"> 2084 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p2162r2.html" target="_top"> 2085 P2162R2 2086 </a> 2087 </td><td align="center"> 11.3 </td><td align="left"> <code class="code">__cpp_lib_variant >= 202102L</code> </td></tr><tr><td align="left"> Printing <code class="code">volatile</code> Pointers </td><td align="left"> 2088 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p1147r1.html" target="_top"> 2089 P1147R1 2090 </a> 2091 </td><td align="center"> 11.3 </td><td align="left"></td></tr><tr><td align="left"> A Proposal to add stacktrace library </td><td align="left"> 2092 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2020/p0881r7.html" target="_top"> 2093 P0881R7 2094 </a> 2095 </td><td align="center"> 12.1 </td><td align="left"> <code class="code">__cpp_lib_stacktrace >= 202011L</code> </td></tr><tr><td align="left"> Add a pmr alias for std::stacktrace </td><td align="left"> 2096 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p2301r1.html" target="_top"> 2097 P2301R1 2098 </a> 2099 </td><td align="center"> 12.1 </td><td align="left"></td></tr><tr><td align="left"> <code class="code">std::expected</code> </td><td align="left"> 2100 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p0323r12.html" target="_top"> 2101 P0323R12 2102 </a> 2103 </td><td align="center"> 12.1 </td><td align="left"> <code class="code">__cpp_lib_expected >= 202202L</code> </td></tr><tr><td align="left"> Monadic operations for std::expected </td><td align="left"> 2104 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p2505r5.html" target="_top"> 2105 P2505R5 2106 </a> 2107 </td><td align="center"> 13.1 </td><td align="left"> <code class="code">__cpp_lib_expected >= 202211L</code> </td></tr><tr><td align="left"> Monadic operations for std::optional </td><td align="left"> 2108 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p0798r8.html" target="_top"> 2109 P0798R8 2110 </a> 2111 </td><td align="center"> 12.1 </td><td align="left"> <code class="code">__cpp_lib_optional >= 202110L</code> </td></tr><tr><td align="left"> 2112 Compatibility between <code class="code">tuple</code>, <code class="code">pair</code> 2113 and <span class="emphasis"><em>tuple-like</em></span> objects </td><td align="left"> 2114 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p2165r4.pdf" target="_top"> 2115 P2165R4 2116 </a> 2117 </td><td align="center"> 14.1 </td><td align="left"> <code class="code">__cpp_lib_tuple_like >= 202207L</code> </td></tr><tr><td align="left"> 2118 Default Arguments for <code class="code">pair</code>'s Forwarding Constructor 2119 </td><td align="left"> 2120 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p1951r1.html" target="_top"> 2121 P1951R1 2122 </a> 2123 </td><td align="center"> 14.1 </td><td align="left"></td></tr><tr><td align="left"> <code class="code">move_only_function</code> </td><td align="left"> 2124 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p0288r9.html" target="_top"> 2125 P0288R9 2126 </a> 2127 </td><td align="center"> 12.1 </td><td align="left"> <code class="code">__cpp_lib_move_only_function >= 202110L</code> </td></tr><tr><td align="left"> <code class="code">invoke_r</code> </td><td align="left"> 2128 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p2136r3.html" target="_top"> 2129 P2136R3 2130 </a> 2131 </td><td align="center"> 12.1 </td><td align="left"> <code class="code">__cpp_lib_invoke_r >= 202106L</code> </td></tr><tr><td align="left"> Byteswapping for fun&&nuf </td><td align="left"> 2132 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p1272r4.html" target="_top"> 2133 P1272R4 2134 </a> 2135 </td><td align="center"> 12.1 </td><td align="left"> <code class="code">__cpp_lib_byteswap >= 202110L</code> </td></tr><tr><td align="left"> Function to mark unreachable code </td><td align="left"> 2136 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p0627r6.pdf" target="_top"> 2137 P0627R6 2138 </a> 2139 </td><td align="center"> 12.1 </td><td align="left"> <code class="code">__cpp_lib_unreachable >= 202202L</code> </td></tr><tr><td align="left"> Add a conditional noexcept specification to std::exchange </td><td align="left"> 2140 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p2401r0.html" target="_top"> 2141 P2401R0 2142 </a> 2143 </td><td align="center"> 12.1 </td><td align="left"></td></tr><tr><td align="left"> A more constexpr bitset </td><td align="left"> 2144 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p2417r2.pdf" target="_top"> 2145 P2417R2 2146 </a> 2147 </td><td align="center"> 13.1 </td><td align="left"> <code class="code">__cpp_lib_constexpr_bitset >= 202207L</code> </td></tr><tr><td align="left"> Extended floating-point types and standard names </td><td align="left"> 2148 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p1467r9.html" target="_top"> 2149 P1467R9 2150 </a> 2151 </td><td align="center"> 13.1 </td><td align="left"></td></tr><tr><td align="left"> Support C atomics in C++ </td><td align="left"> 2152 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2020/p0943r6.html" target="_top"> 2153 P0943R6 2154 </a> 2155 </td><td align="center"> 12.1 </td><td align="left"> <code class="code">__cpp_lib_stdatomic_h >= 202011L</code> </td></tr><tr><td align="left"> Clarifying the status of the "C headers" </td><td align="left"> 2156 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p2340r1.html" target="_top"> 2157 P2340R1 2158 </a> 2159 </td><td align="center"> Yes </td><td align="left"></td></tr><tr><td align="left"> Relax Requirements for time_point::clock </td><td align="left"> 2160 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2020/p2212r2.html" target="_top"> 2161 P2212R2 2162 </a> 2163 </td><td align="center"> Yes </td><td align="left"></td></tr><tr><td align="left"> Removing Garbage Collection Support </td><td align="left"> 2164 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p2186r2.html" target="_top"> 2165 P2186R2 2166 </a> 2167 </td><td align="center"> 12.1 </td><td align="left"></td></tr><tr><td align="left"> Easy [utilities], [ranges], and [iterators] </td><td align="left"> 2168 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p1642r11.html" target="_top"> 2169 P1642R11 2170 </a> 2171 </td><td align="center"> 13.1 </td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left"> Providing size feedback in the Allocator interface </td><td align="left"> 2172 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p0401r6.html" target="_top"> 2173 P0401R6 2174 </a> 2175 </td><td align="center"> </td><td align="left"> <code class="code">__cpp_lib_allocate_at_least >= 202306L</code> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> 2176 Disallow User Specialization of <code class="code">allocator_traits</code> 2177 </td><td align="left"> 2178 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2023/p2652r2.html" target="_top"> 2179 P2652R2 2180 </a> 2181 </td><td align="center"> </td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left"> Explicit lifetime management </td><td align="left"> 2182 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p2590r2.pdf" target="_top"> 2183 P2590R2 2184 </a> 2185 </td><td align="center"> </td><td align="left"> <code class="code">__cpp_lib_start_lifetime_as >= 202207L</code> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> 2186 Fixing <code class="code">std::start_lifetime_as</code> and 2187 <code class="code">std::start_lifetime_as_array</code> 2188 </td><td align="left"> 2189 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2023/p2679r2.pdf" target="_top"> 2190 P2679R2 2191 </a> 2192 </td><td align="center"> </td><td align="left"></td></tr><tr><td align="left"> out_ptr - a scalable output pointer abstraction </td><td align="left"> 2193 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p1132r8.html" target="_top"> 2194 P1132R8 2195 </a> 2196 </td><td align="center"> 14.1 </td><td align="left"> <code class="code">__cpp_lib_out_ptr >= 202106L</code> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> <code class="code">barrier</code>'s phase completion guarantees </td><td align="left"> 2197 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2023/p2588r3.html" target="_top"> 2198 P2588R3 2199 </a> 2200 </td><td align="center"> </td><td align="left"> <code class="code">__cpp_lib_barrier >= 202302L</code> </td></tr><tr bgcolor="#C8B0B0"><td align="left"> 2201 Standard Library Modules <code class="code">std</code> and <code class="code">std.compat</code> 2202 </td><td align="left"> 2203 <a class="link" href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p2465r3.pdf" target="_top"> 2204 P2465R3 2205 </a> 2206 </td><td align="center"> </td><td align="left"> <code class="code">__cpp_lib_modules >= 202207L</code> </td></tr></tbody></table></div></div><br class="table-break" /></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="status.iso.tr1"></a>C++ TR1</h3></div></div></div><p> 2207 This table is based on the table of contents of ISO/IEC DTR 19768, 2208 Doc No: N1836=05-0096, Date: 2005-06-24, 2209 "Draft Technical Report on C++ Library Extensions". 2210 </p><p> 2211 In this implementation the header names are prefixed by 2212 <code class="code">tr1/</code>, for instance <code class="code"><tr1/functional></code>, 2213 <code class="code"><tr1/memory></code>, and so on. 2214 </p><p> 2215 This page describes the TR1 support in 2216 the GCC 14 release series. 2217 </p><div class="table"><a id="table.tr1_status"></a><p class="title"><strong>Table1.11.C++ TR1 Implementation Status</strong></p><div class="table-contents"><table class="table" summary="C++ TR1 Implementation Status" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /></colgroup><thead><tr><th align="left">Section</th><th align="left">Description</th><th align="left">Status</th><th align="left">Comments</th></tr></thead><tbody><tr><td align="left"><span class="emphasis"><em>2</em></span></td><td colspan="3" align="left"><span class="emphasis"><em>General Utilities</em></span></td></tr><tr><td align="left">2.1</td><td align="left">Reference wrappers</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">2.1.1</td><td align="left">Additions to header <code class="code"><functional></code> synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">2.1.2</td><td align="left">Class template <code class="code">reference_wrapper</code></td><td align="left"></td><td align="left"></td></tr><tr><td align="left">2.1.2.1</td><td align="left"><code class="code">reference_wrapper</code> construct/copy/destroy</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">2.1.2.2</td><td align="left"><code class="code">reference_wrapper</code> assignment</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">2.1.2.3</td><td align="left"><code class="code">reference_wrapper</code> access</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">2.1.2.4</td><td align="left"><code class="code">reference_wrapper</code> invocation</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">2.1.2.5</td><td align="left"><code class="code">reference_wrapper</code> helper functions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">2.2</td><td align="left">Smart pointers</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">2.2.1</td><td align="left">Additions to header <code class="code"><memory></code> synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">2.2.2</td><td align="left">Class <code class="code">bad_weak_ptr</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">2.2.3</td><td align="left">Class template <code class="code">shared_ptr</code></td><td align="left"></td><td align="left"> 2218 <p> 2219 Uses code from 2220 <a class="link" href="http://www.boost.org/libs/smart_ptr/shared_ptr.htm" target="_top">boost::shared_ptr</a>. 2221 </p> 2222 </td></tr><tr><td align="left">2.2.3.1</td><td align="left"><code class="code">shared_ptr</code> constructors</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">2.2.3.2</td><td align="left"><code class="code">shared_ptr</code> destructor</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">2.2.3.3</td><td align="left"><code class="code">shared_ptr</code> assignment</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">2.2.3.4</td><td align="left"><code class="code">shared_ptr</code> modifiers</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">2.2.3.5</td><td align="left"><code class="code">shared_ptr</code> observers</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">2.2.3.6</td><td align="left"><code class="code">shared_ptr</code> comparison</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">2.2.3.7</td><td align="left"><code class="code">shared_ptr</code> I/O</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">2.2.3.8</td><td align="left"><code class="code">shared_ptr</code> specialized algorithms</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">2.2.3.9</td><td align="left"><code class="code">shared_ptr</code> casts</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">2.2.3.10</td><td align="left"><code class="code">get_deleter</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">2.2.4</td><td align="left">Class template <code class="code">weak_ptr</code></td><td align="left"></td><td align="left"></td></tr><tr><td align="left">2.2.4.1</td><td align="left"><code class="code">weak_ptr</code> constructors</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">2.2.4.2</td><td align="left"><code class="code">weak_ptr</code> destructor</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">2.2.4.3</td><td align="left"><code class="code">weak_ptr</code> assignment</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">2.2.4.4</td><td align="left"><code class="code">weak_ptr</code> modifiers</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">2.2.4.5</td><td align="left"><code class="code">weak_ptr</code> observers</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">2.2.4.6</td><td align="left"><code class="code">weak_ptr</code> comparison</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">2.2.4.7</td><td align="left"><code class="code">weak_ptr</code> specialized algorithms</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">2.2.5</td><td align="left">Class template <code class="code">enable_shared_from_this</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"><span class="emphasis"><em>3</em></span></td><td colspan="3" align="left"><span class="emphasis"><em>Function Objects</em></span></td></tr><tr><td align="left">3.1</td><td align="left">Definitions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">3.2</td><td align="left">Additions to <code class="code"><functional> synopsis</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">3.3</td><td align="left">Requirements</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">3.4</td><td align="left">Function return types</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">3.5</td><td align="left">Function template <code class="code">mem_fn</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">3.6</td><td align="left">Function object binders</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">3.6.1</td><td align="left">Class template <code class="code">is_bind_expression</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">3.6.2</td><td align="left">Class template <code class="code">is_placeholder</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">3.6.3</td><td align="left">Function template <code class="code">bind</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">3.6.4</td><td align="left">Placeholders</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">3.7</td><td align="left">Polymorphic function wrappers</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">3.7.1</td><td align="left">Class <code class="code">bad_function_call</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">3.7.1.1</td><td align="left"><code class="code">bad_function_call</code> constructor</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">3.7.2</td><td align="left">Class template <code class="code">function</code></td><td align="left"></td><td align="left"></td></tr><tr><td align="left">3.7.2.1</td><td align="left"><code class="code">function</code> construct/copy/destroy</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">3.7.2.2</td><td align="left"><code class="code">function</code> modifiers</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">3.7.2.3</td><td align="left"><code class="code">function</code> capacity</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">3.7.2.4</td><td align="left"><code class="code">function</code> invocation</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">3.7.2.5</td><td align="left"><code class="code">function</code> target access</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">3.7.2.6</td><td align="left">undefined operators</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">3.7.2.7</td><td align="left">null pointer comparison operators</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">3.7.2.8</td><td align="left">specialized algorithms</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"><span class="emphasis"><em>4</em></span></td><td colspan="3" align="left"><span class="emphasis"><em>Metaprogramming and type traits</em></span></td></tr><tr><td align="left">4.1</td><td align="left">Requirements</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">4.2</td><td align="left">Header <code class="code"><type_traits></code> synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">4.3</td><td align="left">Helper classes</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">4.4</td><td align="left">General Requirements</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">4.5</td><td align="left">Unary Type Traits</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">4.5.1</td><td align="left">Primary Type Categories</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">4.5.2</td><td align="left">Composite type traits</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">4.5.3</td><td align="left">Type properties</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">4.6</td><td align="left">Relationships between types</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">4.7</td><td align="left">Transformations between types</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">4.7.1</td><td align="left">Const-volatile modifications</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">4.7.2</td><td align="left">Reference modifications</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">4.7.3</td><td align="left">Array modifications</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">4.7.4</td><td align="left">Pointer modifications</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">4.8</td><td align="left">Other transformations</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">4.9</td><td align="left">Implementation requirements</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"><span class="emphasis"><em>5</em></span></td><td colspan="3" align="left"><span class="emphasis"><em>Numerical Facilities</em></span></td></tr><tr><td align="left">5.1</td><td align="left">Random number generation</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">5.1.1</td><td align="left">Requirements</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">5.1.2</td><td align="left">Header <code class="code"><random></code> synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">5.1.3</td><td align="left">Class template <code class="code">variate_generator</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">5.1.4</td><td align="left">Random number engine class templates</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">5.1.4.1</td><td align="left">Class template <code class="code">linear_congruential</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">5.1.4.2</td><td align="left">Class template <code class="code">mersenne_twister</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">5.1.4.3</td><td align="left">Class template <code class="code">subtract_with_carry</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">5.1.4.4</td><td align="left">Class template <code class="code">subtract_with_carry_01</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">5.1.4.5</td><td align="left">Class template <code class="code">discard_block</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">5.1.4.6</td><td align="left">Class template <code class="code">xor_combine</code></td><td align="left">Y</td><td align="left">operator()() per N2079</td></tr><tr><td align="left">5.1.5</td><td align="left">Engines with predefined parameters</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">5.1.6</td><td align="left">Class <code class="code">random_device</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">5.1.7</td><td align="left">Random distribution class templates</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">5.1.7.1</td><td align="left">Class template <code class="code">uniform_int</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">5.1.7.2</td><td align="left">Class <code class="code">bernoulli_distribution</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">5.1.7.3</td><td align="left">Class template <code class="code">geometric_distribution</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">5.1.7.4</td><td align="left">Class template <code class="code">poisson_distribution</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">5.1.7.5</td><td align="left">Class template <code class="code">binomial_distribution</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">5.1.7.6</td><td align="left">Class template <code class="code">uniform_real</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">5.1.7.7</td><td align="left">Class template <code class="code">exponential_distribution</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">5.1.7.8</td><td align="left">Class template <code class="code">normal_distribution</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">5.1.7.9</td><td align="left">Class template <code class="code">gamma_distribution</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">5.2</td><td align="left">Mathematical special functions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">5.2.1</td><td align="left">Additions to header <code class="code"><cmath></code> synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">5.2.1.1</td><td align="left">associated Laguerre polynomials</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">5.2.1.2</td><td align="left">associated Legendre functions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">5.2.1.3</td><td align="left">beta function</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">5.2.1.4</td><td align="left">(complete) elliptic integral of the first kind</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">5.2.1.5</td><td align="left">(complete) elliptic integral of the second kind</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">5.2.1.6</td><td align="left">(complete) elliptic integral of the third kind</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">5.2.1.7</td><td align="left">confluent hypergeometric functions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">5.2.1.8</td><td align="left">regular modified cylindrical Bessel functions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">5.2.1.9</td><td align="left">cylindrical Bessel functions (of the first kind)</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">5.2.1.10</td><td align="left">irregular modified cylindrical Bessel functions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">5.2.1.11</td><td align="left">cylindrical Neumann functions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">5.2.1.12</td><td align="left">(incomplete) elliptic integral of the first kind</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">5.2.1.13</td><td align="left">(incomplete) elliptic integral of the second kind</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">5.2.1.14</td><td align="left">(incomplete) elliptic integral of the third kind</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">5.2.1.15</td><td align="left">exponential integral</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">5.2.1.16</td><td align="left">Hermite polynomials</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">5.2.1.17</td><td align="left">hypergeometric functions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">5.2.1.18</td><td align="left">Laguerre polynomials</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">5.2.1.19</td><td align="left">Legendre polynomials</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">5.2.1.20</td><td align="left">Riemann zeta function</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">5.2.1.21</td><td align="left">spherical Bessel functions (of the first kind)</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">5.2.1.22</td><td align="left">spherical associated Legendre functions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">5.2.1.23</td><td align="left">spherical Neumann functions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">5.2.2</td><td align="left">Additions to header <code class="code"><math.h></code> synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"><span class="emphasis"><em>6</em></span></td><td colspan="3" align="left"><span class="emphasis"><em>Containers</em></span></td></tr><tr><td align="left">6.1</td><td align="left">Tuple types</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">6.1.1</td><td align="left">Header <code class="code"><tuple></code> synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">6.1.2</td><td align="left">Additions to header <code class="code"><utility></code> synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">6.1.3</td><td align="left">Class template <code class="code">tuple</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">6.1.3.1</td><td align="left">Construction</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">6.1.3.2</td><td align="left">Tuple creation functions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">6.1.3.3</td><td align="left">Tuple helper classes</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">6.1.3.4</td><td align="left">Element access</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">6.1.3.5</td><td align="left">Relational operators</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">6.1.4</td><td align="left">Pairs</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">6.2</td><td align="left">Fixed size array</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">6.2.1</td><td align="left">Header <code class="code"><array></code> synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">6.2.2</td><td align="left">Class template <code class="code">array</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">6.2.2.1</td><td align="left"><code class="code">array</code> constructors, copy, and assignment</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">6.2.2.2</td><td align="left"><code class="code">array</code> specialized algorithms</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">6.2.2.3</td><td align="left"><code class="code">array</code> size</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">6.2.2.4</td><td align="left">Zero sized <code class="code">array</code>s</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">6.2.2.5</td><td align="left">Tuple interface to class template <code class="code">array</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">6.3</td><td align="left">Unordered associative containers</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">6.3.1</td><td align="left">Unordered associative container requirements</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">6.3.1.1</td><td align="left">Exception safety guarantees</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">6.3.2</td><td align="left">Additions to header <code class="code"><functional></code> synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">6.3.3</td><td align="left">Class template <code class="code">hash</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">6.3.4</td><td align="left">Unordered associative container classes</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">6.3.4.1</td><td align="left">Header <code class="code"><unordered_set></code> synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">6.3.4.2</td><td align="left">Header <code class="code"><unordered_map></code> synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">6.3.4.3</td><td align="left">Class template <code class="code">unordered_set</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">6.3.4.3.1</td><td align="left"><code class="code">unordered_set</code> constructors</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">6.3.4.3.2</td><td align="left"><code class="code">unordered_set</code> swap</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">6.3.4.4</td><td align="left">Class template <code class="code">unordered_map</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">6.3.4.4.1</td><td align="left"><code class="code">unordered_map</code> constructors</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">6.3.4.4.2</td><td align="left"><code class="code">unordered_map</code> element access</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">6.3.4.4.3</td><td align="left"><code class="code">unordered_map</code> swap</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">6.3.4.5</td><td align="left">Class template <code class="code">unordered_multiset</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">6.3.4.5.1</td><td align="left"><code class="code">unordered_multiset</code> constructors</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">6.3.4.5.2</td><td align="left"><code class="code">unordered_multiset</code> swap</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">6.3.4.6</td><td align="left">Class template <code class="code">unordered_multimap</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">6.3.4.6.1</td><td align="left"><code class="code">unordered_multimap</code> constructors</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">6.3.4.6.2</td><td align="left"><code class="code">unordered_multimap</code> swap</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left"><span class="emphasis"><em>7</em></span></td><td colspan="3" align="left"><span class="emphasis"><em>Regular Expressions</em></span></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.1</td><td align="left">Definitions</td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.2</td><td align="left">Requirements</td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.3</td><td align="left">Regular expressions summary</td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.4</td><td align="left">Header <code class="code"><regex></code> synopsis</td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.5</td><td align="left">Namespace <code class="code">tr1::regex_constants</code></td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.5.1</td><td align="left">Bitmask Type <code class="code">syntax_option_type</code></td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.5.2</td><td align="left">Bitmask Type <code class="code">regex_constants::match_flag_type</code></td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.5.3</td><td align="left">Implementation defined <code class="code">error_type</code></td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.6</td><td align="left">Class <code class="code">regex_error</code></td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.7</td><td align="left">Class template <code class="code">regex_traits</code></td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.8</td><td align="left">Class template <code class="code">basic_regex</code></td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.8.1</td><td align="left"><code class="code">basic_regex</code> constants</td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.8.2</td><td align="left"><code class="code">basic_regex</code> constructors</td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.8.3</td><td align="left"><code class="code">basic_regex</code> assign</td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.8.4</td><td align="left"><code class="code">basic_regex</code> constant operations</td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.8.5</td><td align="left"><code class="code">basic_regex</code> locale</td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.8.6</td><td align="left"><code class="code">basic_regex</code> swap</td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.8.7</td><td align="left"><code class="code">basic_regex</code> non-member functions</td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.8.7.1</td><td align="left"><code class="code">basic_regex</code> non-member swap</td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.9</td><td align="left">Class template <code class="code">sub_match</code></td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.9.1</td><td align="left"><code class="code">sub_match</code> members</td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.9.2</td><td align="left"><code class="code">sub_match</code> non-member operators</td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.10</td><td align="left">Class template <code class="code">match_results</code></td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.10.1</td><td align="left"><code class="code">match_results</code> constructors</td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.10.2</td><td align="left"><code class="code">match_results</code> size</td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.10.3</td><td align="left"><code class="code">match_results</code> element access</td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.10.4</td><td align="left"><code class="code">match_results</code> formatting</td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.10.5</td><td align="left"><code class="code">match_results</code> allocator</td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.10.6</td><td align="left"><code class="code">match_results</code> swap</td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.11</td><td align="left">Regular expression algorithms</td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.11.1</td><td align="left">exceptions</td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.11.2</td><td align="left"><code class="code">regex_match</code></td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.11.3</td><td align="left"><code class="code">regex_search</code></td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.11.4</td><td align="left"><code class="code">regex_replace</code></td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.12</td><td align="left">Regular expression Iterators</td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.12.1</td><td align="left">Class template <code class="code">regex_iterator</code></td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.12.1.1</td><td align="left"><code class="code">regex_iterator</code> constructors</td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.12.1.2</td><td align="left"><code class="code">regex_iterator</code> comparisons</td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.12.1.3</td><td align="left"><code class="code">regex_iterator</code> dereference</td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.12.1.4</td><td align="left"><code class="code">regex_iterator</code> increment</td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.12.2</td><td align="left">Class template <code class="code">regex_token_iterator</code></td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.12.2.1</td><td align="left"><code class="code">regex_token_iterator</code> constructors</td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.12.2.2</td><td align="left"><code class="code">regex_token_iterator</code> comparisons</td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.12.2.3</td><td align="left"><code class="code">regex_token_iterator</code> dereference</td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.12.2.4</td><td align="left"><code class="code">regex_token_iterator</code> increment</td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">7.13</td><td align="left">Modified ECMAScript regular expression grammar</td><td align="left">N</td><td align="left"></td></tr><tr><td align="left"><span class="emphasis"><em>8</em></span></td><td colspan="3" align="left"><span class="emphasis"><em>C Compatibility</em></span></td></tr><tr><td align="left">8.1</td><td align="left">Additions to header <code class="code"><complex></code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.1.1</td><td align="left">Synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.1.2</td><td align="left">Function <code class="code">acos</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.1.3</td><td align="left">Function <code class="code">asin</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.1.4</td><td align="left">Function <code class="code">atan</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.1.5</td><td align="left">Function <code class="code">acosh</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.1.6</td><td align="left">Function <code class="code">asinh</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.1.7</td><td align="left">Function <code class="code">atanh</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.1.8</td><td align="left">Function <code class="code">fabs</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.1.9</td><td align="left">Additional Overloads</td><td align="left">Y</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">8.2</td><td align="left">Header <code class="code"><ccomplex></code></td><td align="left">N</td><td align="left">DR 551</td></tr><tr bgcolor="#C8B0B0"><td align="left">8.3</td><td align="left">Header <code class="code"><complex.h></code></td><td align="left">N</td><td align="left">DR 551</td></tr><tr><td align="left">8.4</td><td align="left">Additions to header <code class="code"><cctype></code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.4.1</td><td align="left">Synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.4.2</td><td align="left">Function <code class="code">isblank</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.5</td><td align="left">Additions to header <code class="code"><ctype.h></code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.6</td><td align="left">Header <code class="code"><cfenv></code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.6.1</td><td align="left">Synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.6.2</td><td align="left">Definitions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.7</td><td align="left">Header <code class="code"><fenv.h></code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.8</td><td align="left">Additions to header <code class="code"><cfloat></code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.9</td><td align="left">Additions to header <code class="code"><float.h></code></td><td align="left">Y</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">8.10</td><td align="left">Additions to header <code class="code"><ios></code></td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">8.10.1</td><td align="left">Synopsis</td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">8.10.2</td><td align="left">Function <code class="code">hexfloat</code></td><td align="left">N</td><td align="left"></td></tr><tr><td align="left">8.11</td><td align="left">Header <code class="code"><cinttypes></code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.11.1</td><td align="left">Synopsis</td><td align="left">Y</td><td align="left">DR 557</td></tr><tr><td align="left">8.11.2</td><td align="left">Definitions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.12</td><td align="left">Header <code class="code"><inttypes.h></code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.13</td><td align="left">Additions to header <code class="code"><climits></code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.14</td><td align="left">Additions to header <code class="code"><limits.h></code></td><td align="left">Y</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">8.15</td><td align="left">Additions to header <code class="code"><locale></code></td><td align="left">N</td><td align="left"></td></tr><tr><td align="left">8.16</td><td align="left">Additions to header <code class="code"><cmath></code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.16.1</td><td align="left">Synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.16.2</td><td align="left">Definitions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.16.3</td><td align="left">Function template definitions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.16.4</td><td align="left">Additional overloads</td><td align="left">Y</td><td align="left">DR 568; DR 550</td></tr><tr><td align="left">8.17</td><td align="left">Additions to header <code class="code"><math.h></code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.18</td><td align="left">Additions to header <code class="code"><cstdarg></code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.19</td><td align="left">Additions to header <code class="code"><stdarg.h></code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.20</td><td align="left">The header <code class="code"><cstdbool></code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.21</td><td align="left">The header <code class="code"><stdbool.h></code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.22</td><td align="left">The header <code class="code"><cstdint></code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.22.1</td><td align="left">Synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.22.2</td><td align="left">Definitions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.23</td><td align="left">The header <code class="code"><stdint.h></code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.24</td><td align="left">Additions to header <code class="code"><cstdio></code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.24.1</td><td align="left">Synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.24.2</td><td align="left">Definitions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.24.3</td><td align="left">Additional format specifiers</td><td align="left">Y</td><td align="left">C library dependency</td></tr><tr><td align="left">8.24.4</td><td align="left">Additions to header <code class="code"><stdio.h></code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.25</td><td align="left">Additions to header <code class="code"><cstdlib></code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.25.1</td><td align="left">Synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.25.2</td><td align="left">Definitions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.25.3</td><td align="left">Function <code class="code">abs</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.25.4</td><td align="left">Function <code class="code">div</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.26</td><td align="left">Additions to header <code class="code"><stdlib.h></code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.27</td><td align="left">Header <code class="code"><ctgmath></code></td><td align="left">Y</td><td align="left">DR 551</td></tr><tr><td align="left">8.28</td><td align="left">Header <code class="code"><tgmath.h></code></td><td align="left">Y</td><td align="left">DR 551</td></tr><tr><td align="left">8.29</td><td align="left">Additions to header <code class="code"><ctime></code></td><td align="left">Y</td><td align="left">C library dependency</td></tr><tr><td align="left">8.30</td><td align="left">Additions to header <code class="code"><cwchar></code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.30.1</td><td align="left">Synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.30.2</td><td align="left">Definitions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.30.3</td><td align="left">Additional wide format specifiers</td><td align="left">Y</td><td align="left">C library dependency</td></tr><tr><td align="left">8.31</td><td align="left">Additions to header <code class="code"><wchar.h></code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.32</td><td align="left">Additions to header <code class="code"><cwctype></code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.32.1</td><td align="left">Synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.32.2</td><td align="left">Function <code class="code">iswblank</code></td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.33</td><td align="left">Additions to header <code class="code"><wctype.h></code></td><td align="left">Y</td><td align="left"></td></tr></tbody></table></div></div><br class="table-break" /><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="iso.tr1.specific"></a>Implementation Specific Behavior</h4></div></div></div><p>For behaviour which is specified by the 1998 and 2003 standards, 2223 see <a class="link" href="status.html#iso.1998.specific" title="Implementation Specific Behavior">C++ 1998/2003 Implementation 2224 Specific Behavior</a>. This section documents behaviour which 2225 is required by TR1. 2226 </p><p> 2227 <span class="emphasis"><em>3.6.4 [tr.func.bind.place]/1</em></span> There are 29 2228 placeholders defined and the placeholder types are 2229 <code class="literal">Assignable</code>. 2230 </p></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="status.iso.tr24733"></a>C++ TR 24733</h3></div></div></div><p> 2231 This table is based on the table of contents of 2232 ISO/IEC TR 24733:2011, 2233 "Extensions for the programming language C++ to support 2234 decimal floating-point arithmetic". 2235 </p><p> 2236 This page describes the TR 24733 support in 2237 the GCC 14 release series. 2238 </p><div class="table"><a id="table.decfp_status"></a><p class="title"><strong>Table1.12.C++ TR 24733 Implementation Status</strong></p><div class="table-contents"><table class="table" summary="C++ TR 24733 Implementation Status" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /></colgroup><thead><tr><th align="left">Section</th><th align="left">Description</th><th align="left">Status</th><th align="left">Comments</th></tr></thead><tbody><tr><td align="left"> 2239 <span class="emphasis"><em>0</em></span> 2240 </td><td colspan="3" align="left"> 2241 <span class="emphasis"><em>Introduction</em></span> 2242 </td></tr><tr><td align="left"> 2243 <span class="emphasis"><em>1</em></span> 2244 </td><td colspan="3" align="left"> 2245 <span class="emphasis"><em>Normative references</em></span> 2246 </td></tr><tr><td align="left"> 2247 <span class="emphasis"><em>2</em></span> 2248 </td><td colspan="3" align="left"> 2249 <span class="emphasis"><em>Conventions</em></span> 2250 </td></tr><tr><td align="left"> 2251 <span class="emphasis"><em>3</em></span> 2252 </td><td colspan="3" align="left"> 2253 <span class="emphasis"><em>Decimal floating-point types</em></span> 2254 </td></tr><tr><td align="left">3.1</td><td align="left">Characteristics of decimal floating-point types</td><td align="left"></td><td align="left"></td></tr><tr><td align="left">3.2</td><td align="left">Decimal Types</td><td align="left"></td><td align="left"></td></tr><tr bgcolor="#B0B0B0"><td align="left">3.2.1</td><td align="left">Class <code class="code">decimal</code> synopsis</td><td align="left">Partial</td><td align="left">Missing declarations for formatted input/output; non-conforming extension for functions converting to integral type</td></tr><tr bgcolor="#B0B0B0"><td align="left">3.2.2</td><td align="left">Class <code class="code">decimal32</code></td><td align="left">Partial</td><td align="left">Missing 3.2.2.5 conversion to integral type; conforming extension for conversion from scalar decimal floating-point</td></tr><tr bgcolor="#B0B0B0"><td align="left">3.2.3</td><td align="left">Class <code class="code">decimal64</code></td><td align="left">Partial</td><td align="left">Missing 3.2.3.5 conversion to integral type; conforming extension for conversion from scalar decimal floating-point</td></tr><tr bgcolor="#B0B0B0"><td align="left">3.2.4</td><td align="left">Class <code class="code">decimal128</code></td><td align="left">Partial</td><td align="left">Missing 3.2.4.5 conversion to integral type; conforming extension for conversion from scalar decimal floating-point</td></tr><tr><td align="left">3.2.5</td><td align="left">Initialization from coefficient and exponent</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">3.2.6</td><td align="left">Conversion to generic floating-point type</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">3.2.7</td><td align="left">Unary arithmetic operators</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">3.2.8</td><td align="left">Binary arithmetic operators</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">3.2.9</td><td align="left">Comparison operators</td><td align="left">Y</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">3.2.10</td><td align="left">Formatted input</td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">3.2.11</td><td align="left">Formatted output</td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">3.3</td><td align="left">Additions to header <code class="code">limits</code></td><td align="left">N</td><td align="left"></td></tr><tr><td align="left">3.4</td><td align="left">Headers <code class="code">cfloat</code> and <code class="code">float.h</code></td><td align="left"></td><td align="left"></td></tr><tr><td align="left">3.4.2</td><td align="left">Additions to header <code class="code">cfloat</code> synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr bgcolor="#B0B0B0"><td align="left">3.4.3</td><td align="left">Additions to header <code class="code">float.h</code> synopsis</td><td align="left">N</td><td align="left"></td></tr><tr><td align="left">3.4.4</td><td align="left">Maximum finite value</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">3.4.5</td><td align="left">Epsilon</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">3.4.6</td><td align="left">Minimum positive normal value</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">3.4.7</td><td align="left">Minimum positive subnormal value</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">3.4.8</td><td align="left">Evaluation format</td><td align="left">Y</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">3.5</td><td align="left">Additions to <code class="code">cfenv</code> and <code class="code">fenv.h</code></td><td align="left">Outside the scope of GCC</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">3.6</td><td align="left">Additions to <code class="code">cmath</code> and <code class="code">math.h</code></td><td align="left">Outside the scope of GCC</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">3.7</td><td align="left">Additions to <code class="code">cstdio</code> and <code class="code">stdio.h</code></td><td align="left">Outside the scope of GCC</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">3.8</td><td align="left">Additions to <code class="code">cstdlib</code> and <code class="code">stdlib.h</code></td><td align="left">Outside the scope of GCC</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">3.9</td><td align="left">Additions to <code class="code">cwchar</code> and <code class="code">wchar.h</code></td><td align="left">Outside the scope of GCC</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">3.10</td><td align="left">Facets</td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">3.11</td><td align="left">Type traits</td><td align="left">N</td><td align="left"></td></tr><tr bgcolor="#C8B0B0"><td align="left">3.12</td><td align="left">Hash functions</td><td align="left">N</td><td align="left"></td></tr><tr><td align="left"> 2255 <span class="emphasis"><em>4</em></span> 2256 </td><td colspan="3" align="left"> 2257 <span class="emphasis"><em>Notes on C compatibility</em></span> 2258 </td></tr></tbody></table></div></div><br class="table-break" /></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="status.iso.specfun"></a>C++ IS 29124</h3></div></div></div><p> 2259 This table is based on the table of contents of ISO/IEC FDIS 29124, 2260 Doc No: N3060, Date: 2010-03-06, 2261 "Extensions to the C++ Library to support mathematical special functions". 2262 </p><p> 2263 Complete support for IS 29124 is in GCC 6.1 and later releases, when using 2264 at least C++11 (for older releases or C++98/C++03 use TR1 instead). 2265 For C++11 and C++14 the additions to the library are not declared by their 2266 respective headers unless <code class="code">__STDCPP_WANT_MATH_SPEC_FUNCS__</code> 2267 is defined as a macro that expands to a non-zero integer constant. 2268 For C++17 the special functions are always declared (since GCC 7.1). 2269 </p><p> 2270 When the special functions are declared the macro 2271 <code class="code">__STDCPP_MATH_SPEC_FUNCS__</code> is defined to <code class="code">201003L</code>. 2272 </p><p> 2273 In addition to the special functions defined in IS 29124, for 2274 non-strict modes (i.e. <code class="code">-std=gnu++NN</code> modes) the 2275 hypergeometric functions and confluent hypergeometric functions 2276 from TR1 are also provided, defined in namespace 2277 <code class="code">__gnu_cxx</code>. 2278 </p><div class="table"><a id="table.specfun_status"></a><p class="title"><strong>Table1.13.C++ Special Functions Implementation Status</strong></p><div class="table-contents"><table class="table" summary="C++ Special Functions Implementation Status" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /></colgroup><thead><tr><th align="left">Section</th><th align="left">Description</th><th align="left">Status</th><th align="left">Comments</th></tr></thead><tbody><tr bgcolor="#B0B0B0"><td align="left">7</td><td align="left">Macro names</td><td align="left">Partial</td><td align="left">No diagnostic for inconsistent definitions of 2279 <code class="code">__STDCPP_WANT_MATH_SPEC_FUNCS__</code></td></tr><tr><td align="left">8</td><td align="left">Mathematical special functions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.1</td><td align="left">Additions to header <code class="code"><cmath></code> synopsis</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.1.1</td><td align="left">associated Laguerre polynomials</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.1.2</td><td align="left">associated Legendre functions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.1.3</td><td align="left">beta function</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.1.4</td><td align="left">(complete) elliptic integral of the first kind</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.1.5</td><td align="left">(complete) elliptic integral of the second kind</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.1.6</td><td align="left">(complete) elliptic integral of the third kind</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.1.7</td><td align="left">regular modified cylindrical Bessel functions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.1.8</td><td align="left">cylindrical Bessel functions (of the first kind)</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.1.9</td><td align="left">irregular modified cylindrical Bessel functions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.1.10</td><td align="left">cylindrical Neumann functions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.1.11</td><td align="left">(incomplete) elliptic integral of the first kind</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.1.12</td><td align="left">(incomplete) elliptic integral of the second kind</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.1.13</td><td align="left">(incomplete) elliptic integral of the third kind</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.1.14</td><td align="left">exponential integral</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.1.15</td><td align="left">Hermite polynomials</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.1.16</td><td align="left">Laguerre polynomials</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.1.17</td><td align="left">Legendre polynomials</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.1.18</td><td align="left">Riemann zeta function</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.1.19</td><td align="left">spherical Bessel functions (of the first kind)</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.1.20</td><td align="left">spherical associated Legendre functions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.1.21</td><td align="left">spherical Neumann functions</td><td align="left">Y</td><td align="left"></td></tr><tr><td align="left">8.2</td><td align="left">Additions to header <code class="code"><math.h></code></td><td align="left">Y</td><td align="left"></td></tr><tr bgcolor="#B0B0B0"><td align="left">8.3</td><td align="left">The header <code class="code"><ctgmath></code></td><td align="left">Partial</td><td align="left">Conflicts with C++ 2011 requirements.</td></tr><tr bgcolor="#C8B0B0"><td align="left">8.4</td><td align="left">The header <code class="code"><tgmath.h></code></td><td align="left">N</td><td align="left">Conflicts with C++ 2011 requirements.</td></tr></tbody></table></div></div><br class="table-break" /><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="iso.specfun.specific"></a>Implementation Specific Behavior</h4></div></div></div><p>For behaviour which is specified by the 2011 standard, 2280 see <a class="link" href="status.html#iso.2011.specific" title="Implementation Specific Behavior">C++ 2011 Implementation 2281 Specific Behavior</a>. This section documents behaviour which 2282 is required by IS 29124. 2283 </p><p> 2284 <span class="emphasis"><em>7.2 [macro.user]/3 /4</em></span> The functions declared in 2285 Clause 8 are only declared when 2286 <code class="code">__STDCPP_WANT_MATH_SPEC_FUNCS__ == 1</code> 2287 (or in C++17 mode, for GCC 7.1 and later). 2288 </p><p> 2289 <span class="emphasis"><em>8.1.1 [sf.cmath.Lnm]/1</em></span> The effect of calling 2290 these functions with <code class="code">n >= 128</code> or <code class="code">m >= 128</code> 2291 should be described here. 2292 </p><p> 2293 <span class="emphasis"><em>8.1.2 [sf.cmath.Plm]/3</em></span> The effect of calling 2294 these functions with <code class="code">l >= 128</code> should be described here. 2295 </p><p> 2296 <span class="emphasis"><em>8.1.3 [sf.cmath.I]/3</em></span> The effect of calling 2297 these functions with <code class="code">nu >= 128</code> should be described here. 2298 </p><p> 2299 <span class="emphasis"><em>8.1.8 [sf.cmath.J]/3</em></span> The effect of calling 2300 these functions with <code class="code">nu >= 128</code> should be described here. 2301 </p><p> 2302 <span class="emphasis"><em>8.1.9 [sf.cmath.K]/3</em></span> The effect of calling 2303 these functions with <code class="code">nu >= 128</code> should be described here. 2304 </p><p> 2305 <span class="emphasis"><em>8.1.10 [sf.cmath.N]/3</em></span> The effect of calling 2306 these functions with <code class="code">nu >= 128</code> should be described here. 2307 </p><p> 2308 <span class="emphasis"><em>8.1.15 [sf.cmath.Hn]/3</em></span> The effect of calling 2309 these functions with <code class="code">n >= 128</code> should be described here. 2310 </p><p> 2311 <span class="emphasis"><em>8.1.16 [sf.cmath.Ln]/3</em></span> The effect of calling 2312 these functions with <code class="code">n >= 128</code> should be described here. 2313 </p><p> 2314 <span class="emphasis"><em>8.1.17 [sf.cmath.Pl]/3</em></span> The effect of calling 2315 these functions with <code class="code">l >= 128</code> should be described here. 2316 </p><p> 2317 <span class="emphasis"><em>8.1.19 [sf.cmath.j]/3</em></span> The effect of calling 2318 these functions with <code class="code">n >= 128</code> should be described here. 2319 </p><p> 2320 <span class="emphasis"><em>8.1.20 [sf.cmath.Ylm]/3</em></span> The effect of calling 2321 these functions with <code class="code">l >= 128</code> should be described here. 2322 </p><p> 2323 <span class="emphasis"><em>8.1.21 [sf.cmath.n]/3</em></span> The effect of calling 2324 these functions with <code class="code">n >= 128</code> should be described here. 2325 </p></div></div></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="intro.html">Prev</a></td><td width="20%" align="center"><a accesskey="u" href="intro.html">Up</a></td><td width="40%" align="right"><a accesskey="n" href="license.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">PartI. 2326 Introduction 2327 2328 </td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top">License</td></tr></table></div></body></html>
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