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      1 // <experimental/array> -*- C++ -*-
      2 
      3 // Copyright (C) 2015-2017 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 >= 201402L
     35 
     36 #include <array>
     37 #include <experimental/type_traits>
     38 
     39 namespace std _GLIBCXX_VISIBILITY(default)
     40 {
     41 namespace experimental
     42 {
     43 inline namespace fundamentals_v2
     44 {
     45 _GLIBCXX_BEGIN_NAMESPACE_VERSION
     46 
     47 #define __cpp_lib_experimental_make_array 201505
     48   /**
     49    * @defgroup make_array Array creation functions
     50    * @ingroup experimental
     51    *
     52    * Array creation functions as described in N4529,
     53    * Working Draft, C++ Extensions for Library Fundamentals, Version 2
     54    *
     55    * @{
     56    */
     57 
     58 template<typename _Dest, typename... _Types>
     59   struct __make_array_elem
     60   {
     61     using type = _Dest;
     62   };
     63 
     64 template<typename... _Types>
     65   struct __make_array_elem<void, _Types...>
     66   : common_type<_Types...>
     67   {
     68     template <typename>
     69       struct __is_reference_wrapper : false_type
     70       {};
     71 
     72     template <typename _Up>
     73       struct __is_reference_wrapper<reference_wrapper<_Up>> : true_type
     74       {};
     75 
     76     static_assert(!__or_<__is_reference_wrapper<decay_t<_Types>>...>::value,
     77                   "make_array must be used with an explicit target type when"
     78                   "any of the arguments is a reference_wrapper");
     79   };
     80 
     81 template <typename _Dest = void, typename... _Types>
     82   constexpr
     83   array<typename __make_array_elem<_Dest, _Types...>::type, sizeof...(_Types)>
     84   make_array(_Types&&... __t)
     85   {
     86     return {{ std::forward<_Types>(__t)... }};
     87   }
     88 
     89 template <typename _Tp, size_t _Nm, size_t... _Idx>
     90   constexpr array<remove_cv_t<_Tp>, _Nm>
     91   __to_array(_Tp (&__a)[_Nm], index_sequence<_Idx...>)
     92   {
     93     return {{__a[_Idx]...}};
     94   }
     95 
     96 template <typename _Tp, size_t _Nm>
     97   constexpr array<remove_cv_t<_Tp>, _Nm>
     98   to_array(_Tp (&__a)[_Nm])
     99   noexcept(is_nothrow_constructible<remove_cv_t<_Tp>, _Tp&>::value)
    100   {
    101     return __to_array(__a, make_index_sequence<_Nm>{});
    102   }
    103 
    104   // @} group make_array
    105   _GLIBCXX_END_NAMESPACE_VERSION
    106 } // namespace fundamentals_v2
    107 } // namespace experimental
    108 
    109 } // namespace std
    110 
    111 #endif // C++14
    112 
    113 #endif // _GLIBCXX_EXPERIMENTAL_ARRAY
    114