82 lines
2.4 KiB
C++
82 lines
2.4 KiB
C++
// <experimental/tuple> -*- C++ -*-
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// Copyright (C) 2014-2020 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/tuple
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* This is a TS C++ Library header.
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* @ingroup libfund-ts
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*/
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#ifndef _GLIBCXX_EXPERIMENTAL_TUPLE
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#define _GLIBCXX_EXPERIMENTAL_TUPLE 1
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#pragma GCC system_header
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#if __cplusplus >= 201402L
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#include <tuple>
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#include <bits/invoke.h>
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#include <experimental/bits/lfts_config.h>
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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_v1
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{
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// See C++14 20.4.2.5, tuple helper classes
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template <typename _Tp>
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constexpr size_t tuple_size_v = tuple_size<_Tp>::value;
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#define __cpp_lib_experimental_tuple 201402
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template <typename _Fn, typename _Tuple, std::size_t... _Idx>
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constexpr decltype(auto)
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__apply_impl(_Fn&& __f, _Tuple&& __t, std::index_sequence<_Idx...>)
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{
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return std::__invoke(std::forward<_Fn>(__f),
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std::get<_Idx>(std::forward<_Tuple>(__t))...);
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}
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template <typename _Fn, typename _Tuple>
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constexpr decltype(auto)
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apply(_Fn&& __f, _Tuple&& __t)
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{
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using _Indices =
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std::make_index_sequence<tuple_size_v<std::decay_t<_Tuple>>>;
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return experimental::__apply_impl(std::forward<_Fn>(__f),
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std::forward<_Tuple>(__t),
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_Indices{});
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}
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} // namespace fundamentals_v1
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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_TUPLE
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