1*38fd1498Szrj// <experimental/array> -*- C++ -*- 2*38fd1498Szrj 3*38fd1498Szrj// Copyright (C) 2015-2018 Free Software Foundation, Inc. 4*38fd1498Szrj// 5*38fd1498Szrj// This file is part of the GNU ISO C++ Library. This library is free 6*38fd1498Szrj// software; you can redistribute it and/or modify it under the 7*38fd1498Szrj// terms of the GNU General Public License as published by the 8*38fd1498Szrj// Free Software Foundation; either version 3, or (at your option) 9*38fd1498Szrj// any later version. 10*38fd1498Szrj 11*38fd1498Szrj// This library is distributed in the hope that it will be useful, 12*38fd1498Szrj// but WITHOUT ANY WARRANTY; without even the implied warranty of 13*38fd1498Szrj// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14*38fd1498Szrj// GNU General Public License for more details. 15*38fd1498Szrj 16*38fd1498Szrj// Under Section 7 of GPL version 3, you are granted additional 17*38fd1498Szrj// permissions described in the GCC Runtime Library Exception, version 18*38fd1498Szrj// 3.1, as published by the Free Software Foundation. 19*38fd1498Szrj 20*38fd1498Szrj// You should have received a copy of the GNU General Public License and 21*38fd1498Szrj// a copy of the GCC Runtime Library Exception along with this program; 22*38fd1498Szrj// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23*38fd1498Szrj// <http://www.gnu.org/licenses/>. 24*38fd1498Szrj 25*38fd1498Szrj/** @file experimental/array 26*38fd1498Szrj * This is a TS C++ Library header. 27*38fd1498Szrj */ 28*38fd1498Szrj 29*38fd1498Szrj#ifndef _GLIBCXX_EXPERIMENTAL_ARRAY 30*38fd1498Szrj#define _GLIBCXX_EXPERIMENTAL_ARRAY 1 31*38fd1498Szrj 32*38fd1498Szrj#pragma GCC system_header 33*38fd1498Szrj 34*38fd1498Szrj#if __cplusplus >= 201402L 35*38fd1498Szrj 36*38fd1498Szrj#include <array> 37*38fd1498Szrj#include <experimental/type_traits> 38*38fd1498Szrj 39*38fd1498Szrjnamespace std _GLIBCXX_VISIBILITY(default) 40*38fd1498Szrj{ 41*38fd1498Szrj_GLIBCXX_BEGIN_NAMESPACE_VERSION 42*38fd1498Szrj 43*38fd1498Szrjnamespace experimental 44*38fd1498Szrj{ 45*38fd1498Szrjinline namespace fundamentals_v2 46*38fd1498Szrj{ 47*38fd1498Szrj#define __cpp_lib_experimental_make_array 201505 48*38fd1498Szrj /** 49*38fd1498Szrj * @defgroup make_array Array creation functions 50*38fd1498Szrj * @ingroup experimental 51*38fd1498Szrj * 52*38fd1498Szrj * Array creation functions as described in N4529, 53*38fd1498Szrj * Working Draft, C++ Extensions for Library Fundamentals, Version 2 54*38fd1498Szrj * 55*38fd1498Szrj * @{ 56*38fd1498Szrj */ 57*38fd1498Szrj 58*38fd1498Szrjtemplate<typename _Dest, typename... _Types> 59*38fd1498Szrj struct __make_array_elem 60*38fd1498Szrj { 61*38fd1498Szrj using type = _Dest; 62*38fd1498Szrj }; 63*38fd1498Szrj 64*38fd1498Szrjtemplate<typename... _Types> 65*38fd1498Szrj struct __make_array_elem<void, _Types...> 66*38fd1498Szrj : common_type<_Types...> 67*38fd1498Szrj { 68*38fd1498Szrj template <typename> 69*38fd1498Szrj struct __is_reference_wrapper : false_type 70*38fd1498Szrj {}; 71*38fd1498Szrj 72*38fd1498Szrj template <typename _Up> 73*38fd1498Szrj struct __is_reference_wrapper<reference_wrapper<_Up>> : true_type 74*38fd1498Szrj {}; 75*38fd1498Szrj 76*38fd1498Szrj static_assert(!__or_<__is_reference_wrapper<decay_t<_Types>>...>::value, 77*38fd1498Szrj "make_array must be used with an explicit target type when" 78*38fd1498Szrj "any of the arguments is a reference_wrapper"); 79*38fd1498Szrj }; 80*38fd1498Szrj 81*38fd1498Szrjtemplate <typename _Dest = void, typename... _Types> 82*38fd1498Szrj constexpr 83*38fd1498Szrj array<typename __make_array_elem<_Dest, _Types...>::type, sizeof...(_Types)> 84*38fd1498Szrj make_array(_Types&&... __t) 85*38fd1498Szrj { 86*38fd1498Szrj return {{ std::forward<_Types>(__t)... }}; 87*38fd1498Szrj } 88*38fd1498Szrj 89*38fd1498Szrjtemplate <typename _Tp, size_t _Nm, size_t... _Idx> 90*38fd1498Szrj constexpr array<remove_cv_t<_Tp>, _Nm> 91*38fd1498Szrj __to_array(_Tp (&__a)[_Nm], index_sequence<_Idx...>) 92*38fd1498Szrj { 93*38fd1498Szrj return {{__a[_Idx]...}}; 94*38fd1498Szrj } 95*38fd1498Szrj 96*38fd1498Szrjtemplate <typename _Tp, size_t _Nm> 97*38fd1498Szrj constexpr array<remove_cv_t<_Tp>, _Nm> 98*38fd1498Szrj to_array(_Tp (&__a)[_Nm]) 99*38fd1498Szrj noexcept(is_nothrow_constructible<remove_cv_t<_Tp>, _Tp&>::value) 100*38fd1498Szrj { 101*38fd1498Szrj return __to_array(__a, make_index_sequence<_Nm>{}); 102*38fd1498Szrj } 103*38fd1498Szrj 104*38fd1498Szrj // @} group make_array 105*38fd1498Szrj} // namespace fundamentals_v2 106*38fd1498Szrj} // namespace experimental 107*38fd1498Szrj 108*38fd1498Szrj_GLIBCXX_END_NAMESPACE_VERSION 109*38fd1498Szrj} // namespace std 110*38fd1498Szrj 111*38fd1498Szrj#endif // C++14 112*38fd1498Szrj 113*38fd1498Szrj#endif // _GLIBCXX_EXPERIMENTAL_ARRAY 114