1// <experimental/tuple> -*- C++ -*-
2
3// Copyright (C) 2014-2015 Free Software Foundation, Inc.
4//
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)
9// any later version.
10
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.
15
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.
19
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/>.
24
25/** @file experimental/tuple
26 *  This is a TS C++ Library header.
27 */
28
29#ifndef _GLIBCXX_EXPERIMENTAL_TUPLE
30#define _GLIBCXX_EXPERIMENTAL_TUPLE 1
31
32#pragma GCC system_header
33
34#if __cplusplus <= 201103L
35# include <bits/c++14_warning.h>
36#else
37
38#include <tuple>
39#include <experimental/lfts_config.h>
40
41namespace std _GLIBCXX_VISIBILITY(default)
42{
43namespace experimental
44{
45inline namespace fundamentals_v1
46{
47_GLIBCXX_BEGIN_NAMESPACE_VERSION
48
49  // See C++14 §20.4.2.5, tuple helper classes
50  template <typename _Tp>
51    constexpr size_t tuple_size_v = tuple_size<_Tp>::value;
52
53#define __cpp_lib_experimental_tuple 201402
54
55  template <typename _Fn, typename _Tuple, std::size_t... _Idx>
56    constexpr decltype(auto)
57    __apply_impl(_Fn&& f, _Tuple&& t, std::index_sequence<_Idx...>)
58    {
59      return std::forward<_Fn>(f)(std::get<_Idx>(std::forward<_Tuple>(t))...);
60    }
61
62  template <typename _Fn, typename _Tuple>
63    constexpr decltype(auto)
64    apply(_Fn&& f, _Tuple&& t)
65    {
66      using _Indices =
67	std::make_index_sequence<std::tuple_size<std::decay_t<_Tuple>>::value>;
68      return __apply_impl(std::forward<_Fn>(f), std::forward<_Tuple>(t),
69			  _Indices{});
70    }
71
72_GLIBCXX_END_NAMESPACE_VERSION
73} // namespace fundamentals_v1
74} // namespace experimental
75} // namespace std
76
77#endif // C++14
78
79#endif // _GLIBCXX_EXPERIMENTAL_TUPLE
80