Home | History | Annotate | Line # | Download | only in std 
      1 // Components for manipulating sequences of characters -*- C++ -*-
      2 
      3 // Copyright (C) 1997-2022 Free Software Foundation, Inc.
      4 //
      5 // This file is part of the GNU ISO C++ Library.  This library is free
      6 // software; you can redistribute it and/or modify it under the
      7 // terms of the GNU General Public License as published by the
      8 // Free Software Foundation; either version 3, or (at your option)
      9 // any later version.
     10 
     11 // This library is distributed in the hope that it will be useful,
     12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
     13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     14 // GNU General Public License for more details.
     15 
     16 // Under Section 7 of GPL version 3, you are granted additional
     17 // permissions described in the GCC Runtime Library Exception, version
     18 // 3.1, as published by the Free Software Foundation.
     19 
     20 // You should have received a copy of the GNU General Public License and
     21 // a copy of the GCC Runtime Library Exception along with this program;
     22 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
     23 // <http://www.gnu.org/licenses/>.
     24 
     25 /** @file include/string
     26  *  This is a Standard C++ Library header.
     27  */
     28 
     29 //
     30 // ISO C++ 14882: 21  Strings library
     31 //
     32 
     33 #ifndef _GLIBCXX_STRING
     34 #define _GLIBCXX_STRING	1
     35 
     36 #pragma GCC system_header
     37 
     38 #include <bits/c++config.h>
     39 #include <bits/stringfwd.h>
     40 #include <bits/char_traits.h>  // NB: In turn includes stl_algobase.h
     41 #include <bits/allocator.h>
     42 #include <bits/cpp_type_traits.h>
     43 #include <bits/localefwd.h>    // For operators >>, <<, and getline.
     44 #include <bits/ostream_insert.h>
     45 #include <bits/stl_iterator_base_types.h>
     46 #include <bits/stl_iterator_base_funcs.h>
     47 #include <bits/stl_iterator.h>
     48 #include <bits/stl_function.h> // For less
     49 #include <ext/numeric_traits.h>
     50 #include <bits/stl_algobase.h>
     51 #include <bits/refwrap.h>
     52 #include <bits/range_access.h>
     53 #include <bits/basic_string.h>
     54 #include <bits/basic_string.tcc>
     55 
     56 #if __cplusplus >= 201703L && _GLIBCXX_USE_CXX11_ABI
     57 namespace std _GLIBCXX_VISIBILITY(default)
     58 {
     59 _GLIBCXX_BEGIN_NAMESPACE_VERSION
     60   namespace pmr {
     61     template<typename _Tp> class polymorphic_allocator;
     62     template<typename _CharT, typename _Traits = char_traits<_CharT>>
     63       using basic_string = std::basic_string<_CharT, _Traits,
     64 					     polymorphic_allocator<_CharT>>;
     65     using string    = basic_string<char>;
     66 #ifdef _GLIBCXX_USE_CHAR8_T
     67     using u8string  = basic_string<char8_t>;
     68 #endif
     69     using u16string = basic_string<char16_t>;
     70     using u32string = basic_string<char32_t>;
     71     using wstring   = basic_string<wchar_t>;
     72   } // namespace pmr
     73 
     74   template<typename _Str>
     75     struct __hash_string_base
     76     : public __hash_base<size_t, _Str>
     77     {
     78       size_t
     79       operator()(const _Str& __s) const noexcept
     80       { return hash<basic_string_view<typename _Str::value_type>>{}(__s); }
     81     };
     82 
     83   template<>
     84     struct hash<pmr::string>
     85     : public __hash_string_base<pmr::string>
     86     { };
     87 #ifdef _GLIBCXX_USE_CHAR8_T
     88   template<>
     89     struct hash<pmr::u8string>
     90     : public __hash_string_base<pmr::u8string>
     91     { };
     92 #endif
     93   template<>
     94     struct hash<pmr::u16string>
     95     : public __hash_string_base<pmr::u16string>
     96     { };
     97   template<>
     98     struct hash<pmr::u32string>
     99     : public __hash_string_base<pmr::u32string>
    100     { };
    101   template<>
    102     struct hash<pmr::wstring>
    103     : public __hash_string_base<pmr::wstring>
    104     { };
    105 
    106 _GLIBCXX_END_NAMESPACE_VERSION
    107 } // namespace std
    108 #endif // C++17
    109 
    110 #if __cplusplus > 201703L
    111 namespace std _GLIBCXX_VISIBILITY(default)
    112 {
    113 _GLIBCXX_BEGIN_NAMESPACE_VERSION
    114 
    115 #define __cpp_lib_erase_if 202002L
    116 
    117   template<typename _CharT, typename _Traits, typename _Alloc,
    118 	   typename _Predicate>
    119     _GLIBCXX20_CONSTEXPR
    120     inline typename basic_string<_CharT, _Traits, _Alloc>::size_type
    121     erase_if(basic_string<_CharT, _Traits, _Alloc>& __cont, _Predicate __pred)
    122     {
    123       using namespace __gnu_cxx;
    124       const auto __osz = __cont.size();
    125       const auto __end = __cont.end();
    126       auto __removed = std::__remove_if(__cont.begin(), __end,
    127 					__ops::__pred_iter(std::ref(__pred)));
    128       __cont.erase(__removed, __end);
    129       return __osz - __cont.size();
    130     }
    131 
    132   template<typename _CharT, typename _Traits, typename _Alloc, typename _Up>
    133     _GLIBCXX20_CONSTEXPR
    134     inline typename basic_string<_CharT, _Traits, _Alloc>::size_type
    135     erase(basic_string<_CharT, _Traits, _Alloc>& __cont, const _Up& __value)
    136     {
    137       using namespace __gnu_cxx;
    138       const auto __osz = __cont.size();
    139       const auto __end = __cont.end();
    140       auto __removed = std::__remove_if(__cont.begin(), __end,
    141 					__ops::__iter_equals_val(__value));
    142       __cont.erase(__removed, __end);
    143       return __osz - __cont.size();
    144     }
    145 _GLIBCXX_END_NAMESPACE_VERSION
    146 } // namespace std
    147 #endif // C++20
    148 
    149 #endif /* _GLIBCXX_STRING */
    150