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// <experimental/tuple> -*- C++ -*- |
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// Copyright (C) 2014-2021 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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|
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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 |
