1// <experimental/tuple> -*- C++ -*-
3// Copyright (C) 2014-2019 Free Software Foundation, Inc.
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)
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.
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.
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/>.
25/** @file experimental/tuple
26 * This is a TS C++ Library header.
29#ifndef _GLIBCXX_EXPERIMENTAL_TUPLE
30#define _GLIBCXX_EXPERIMENTAL_TUPLE 1
32#pragma GCC system_header
34#if __cplusplus >= 201402L
37#include <bits/invoke.h>
38#include <experimental/bits/lfts_config.h>
40namespace std _GLIBCXX_VISIBILITY(default)
42_GLIBCXX_BEGIN_NAMESPACE_VERSION
46inline namespace fundamentals_v1
48 // See C++14 20.4.2.5, tuple helper classes
49 template <typename _Tp>
50 constexpr size_t tuple_size_v = tuple_size<_Tp>::value;
52#define __cpp_lib_experimental_tuple 201402
54 template <typename _Fn, typename _Tuple, std::size_t... _Idx>
55 constexpr decltype(auto)
56 __apply_impl(_Fn&& __f, _Tuple&& __t, std::index_sequence<_Idx...>)
58 return std::__invoke(std::forward<_Fn>(__f),
59 std::get<_Idx>(std::forward<_Tuple>(__t))...);
62 template <typename _Fn, typename _Tuple>
63 constexpr decltype(auto)
64 apply(_Fn&& __f, _Tuple&& __t)
67 std::make_index_sequence<tuple_size_v<std::decay_t<_Tuple>>>;
68 return experimental::__apply_impl(std::forward<_Fn>(__f),
69 std::forward<_Tuple>(__t),
72} // namespace fundamentals_v1
73} // namespace experimental
75_GLIBCXX_END_NAMESPACE_VERSION
80#endif // _GLIBCXX_EXPERIMENTAL_TUPLE