libstdc++
experimental/tuple
Go to the documentation of this file.
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 
41 namespace std _GLIBCXX_VISIBILITY(default)
42 {
43 namespace experimental
44 {
45 inline namespace fundamentals_v1
46 {
47 _GLIBCXX_BEGIN_NAMESPACE_VERSION
48 
49  // See C++14 ยง20.4.2.5, 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