114 lines
3.2 KiB
C++
114 lines
3.2 KiB
C++
// <experimental/array> -*- C++ -*-
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// Copyright (C) 2015-2018 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/** @file experimental/array
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* This is a TS C++ Library header.
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*/
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#ifndef _GLIBCXX_EXPERIMENTAL_ARRAY
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#define _GLIBCXX_EXPERIMENTAL_ARRAY 1
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#pragma GCC system_header
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#if __cplusplus >= 201402L
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#include <array>
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#include <experimental/type_traits>
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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namespace experimental
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{
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inline namespace fundamentals_v2
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{
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#define __cpp_lib_experimental_make_array 201505
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/**
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* @defgroup make_array Array creation functions
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* @ingroup experimental
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*
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* Array creation functions as described in N4529,
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* Working Draft, C++ Extensions for Library Fundamentals, Version 2
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*
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* @{
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*/
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template<typename _Dest, typename... _Types>
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struct __make_array_elem
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{
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using type = _Dest;
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};
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template<typename... _Types>
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struct __make_array_elem<void, _Types...>
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: common_type<_Types...>
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{
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template <typename>
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struct __is_reference_wrapper : false_type
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{};
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template <typename _Up>
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struct __is_reference_wrapper<reference_wrapper<_Up>> : true_type
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{};
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static_assert(!__or_<__is_reference_wrapper<decay_t<_Types>>...>::value,
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"make_array must be used with an explicit target type when"
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"any of the arguments is a reference_wrapper");
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};
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template <typename _Dest = void, typename... _Types>
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constexpr
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array<typename __make_array_elem<_Dest, _Types...>::type, sizeof...(_Types)>
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make_array(_Types&&... __t)
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{
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return {{ std::forward<_Types>(__t)... }};
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}
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template <typename _Tp, size_t _Nm, size_t... _Idx>
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constexpr array<remove_cv_t<_Tp>, _Nm>
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__to_array(_Tp (&__a)[_Nm], index_sequence<_Idx...>)
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{
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return {{__a[_Idx]...}};
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}
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template <typename _Tp, size_t _Nm>
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constexpr array<remove_cv_t<_Tp>, _Nm>
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to_array(_Tp (&__a)[_Nm])
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noexcept(is_nothrow_constructible<remove_cv_t<_Tp>, _Tp&>::value)
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{
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return __to_array(__a, make_index_sequence<_Nm>{});
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}
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// @} group make_array
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} // namespace fundamentals_v2
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} // namespace experimental
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace std
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#endif // C++14
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#endif // _GLIBCXX_EXPERIMENTAL_ARRAY
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