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1 | // <experimental/tuple> -*- C++ -*- |
2 | ||
99dee823 | 3 | // Copyright (C) 2014-2021 Free Software Foundation, Inc. |
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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. | |
1ababc8b | 27 | * @ingroup libfund-ts |
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28 | */ |
29 | ||
30 | #ifndef _GLIBCXX_EXPERIMENTAL_TUPLE | |
31 | #define _GLIBCXX_EXPERIMENTAL_TUPLE 1 | |
32 | ||
33 | #pragma GCC system_header | |
34 | ||
d681026d | 35 | #if __cplusplus >= 201402L |
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36 | |
37 | #include <tuple> | |
3e9f67e6 | 38 | #include <bits/invoke.h> |
e347987d | 39 | #include <experimental/bits/lfts_config.h> |
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40 | |
41 | namespace std _GLIBCXX_VISIBILITY(default) | |
42 | { | |
4a15d842 FD |
43 | _GLIBCXX_BEGIN_NAMESPACE_VERSION |
44 | ||
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45 | namespace experimental |
46 | { | |
47 | inline namespace fundamentals_v1 | |
48 | { | |
3c732e6f | 49 | // See C++14 20.4.2.5, tuple helper classes |
6b17203a VV |
50 | template <typename _Tp> |
51 | constexpr size_t tuple_size_v = tuple_size<_Tp>::value; | |
22274fac | 52 | |
c2513a1f JW |
53 | #define __cpp_lib_experimental_tuple 201402 |
54 | ||
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55 | template <typename _Fn, typename _Tuple, std::size_t... _Idx> |
56 | constexpr decltype(auto) | |
3e9f67e6 | 57 | __apply_impl(_Fn&& __f, _Tuple&& __t, std::index_sequence<_Idx...>) |
ac68f97c | 58 | { |
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59 | return std::__invoke(std::forward<_Fn>(__f), |
60 | std::get<_Idx>(std::forward<_Tuple>(__t))...); | |
ac68f97c | 61 | } |
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62 | |
63 | template <typename _Fn, typename _Tuple> | |
64 | constexpr decltype(auto) | |
3e9f67e6 | 65 | apply(_Fn&& __f, _Tuple&& __t) |
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66 | { |
67 | using _Indices = | |
3e9f67e6 | 68 | std::make_index_sequence<tuple_size_v<std::decay_t<_Tuple>>>; |
285ee2fb JW |
69 | return experimental::__apply_impl(std::forward<_Fn>(__f), |
70 | std::forward<_Tuple>(__t), | |
71 | _Indices{}); | |
22274fac | 72 | } |
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73 | } // namespace fundamentals_v1 |
74 | } // namespace experimental | |
4a15d842 FD |
75 | |
76 | _GLIBCXX_END_NAMESPACE_VERSION | |
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77 | } // namespace std |
78 | ||
79 | #endif // C++14 | |
80 | ||
81 | #endif // _GLIBCXX_EXPERIMENTAL_TUPLE |