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      1 // <experimental/array> -*- C++ -*-
      2 
      3 // Copyright (C) 2015-2016 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 experimental/array
     26  *  This is a TS C++ Library header.
     27  */
     28 
     29 #ifndef _GLIBCXX_EXPERIMENTAL_ARRAY
     30 #define _GLIBCXX_EXPERIMENTAL_ARRAY 1
     31 
     32 #pragma GCC system_header
     33 
     34 #if __cplusplus <= 201103L
     35 # include <bits/c++14_warning.h>
     36 #else
     37 
     38 #include <array>
     39 #include <functional>
     40 #include <experimental/type_traits>
     41 
     42 namespace std _GLIBCXX_VISIBILITY(default)
     43 {
     44 namespace experimental
     45 {
     46 inline namespace fundamentals_v2
     47 {
     48 _GLIBCXX_BEGIN_NAMESPACE_VERSION
     49 
     50 #define __cpp_lib_experimental_make_array 201505
     51   /**
     52    * @defgroup make_array Array creation functions
     53    * @ingroup experimental
     54    *
     55    * Array creation functions as described in N4529,
     56    * Working Draft, C++ Extensions for Library Fundamentals, Version 2
     57    *
     58    * @{
     59    */
     60 
     61 template <typename _Up>
     62   struct __is_reference_wrapper : false_type
     63   {};
     64 
     65 template <typename _Up>
     66   struct __is_reference_wrapper<reference_wrapper<_Up>> : true_type
     67   {};
     68 
     69 template <typename _Dest = void, typename... _Types>
     70   constexpr auto
     71   make_array(_Types&&... __t)
     72     -> array<typename conditional_t<is_void_v<_Dest>,
     73 				    common_type<_Types...>,
     74 				    common_type<_Dest>>::type,
     75              sizeof...(_Types)>
     76   {
     77     static_assert(__or_<
     78                   __not_<is_void<_Dest>>,
     79                   __and_<__not_<__is_reference_wrapper<decay_t<_Types>>>...>>
     80                   ::value,
     81                   "make_array cannot be used without an explicit target type "
     82                   "if any of the types given is a reference_wrapper");
     83     return {{ std::forward<_Types>(__t)... }};
     84   }
     85 
     86 template <typename _Tp, size_t _Nm, size_t... _Idx>
     87   constexpr array<remove_cv_t<_Tp>, _Nm>
     88   __to_array(_Tp (&__a)[_Nm], index_sequence<_Idx...>)
     89   {
     90     return {{__a[_Idx]...}};
     91   }
     92 
     93 template <typename _Tp, size_t _Nm>
     94   constexpr array<remove_cv_t<_Tp>, _Nm>
     95   to_array(_Tp (&__a)[_Nm])
     96   noexcept(is_nothrow_constructible<remove_cv_t<_Tp>, _Tp&>::value)
     97   {
     98     return __to_array(__a, make_index_sequence<_Nm>{});
     99   }
    100 
    101   // @} group make_array
    102   _GLIBCXX_END_NAMESPACE_VERSION
    103 } // namespace fundamentals_v2
    104 } // namespace experimental
    105 
    106 } // namespace std
    107 
    108 #endif // C++14
    109 
    110 #endif // _GLIBCXX_EXPERIMENTAL_ARRAY
    111