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1 | // <experimental/tuple> -*- C++ -*- |
2 | ||
a945c346 | 3 | // Copyright (C) 2014-2024 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 | ||
18f176d0 AA |
35 | #include <bits/requires_hosted.h> // experimental is currently omitted |
36 | ||
d681026d | 37 | #if __cplusplus >= 201402L |
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38 | |
39 | #include <tuple> | |
3e9f67e6 | 40 | #include <bits/invoke.h> |
e347987d | 41 | #include <experimental/bits/lfts_config.h> |
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42 | |
43 | namespace std _GLIBCXX_VISIBILITY(default) | |
44 | { | |
4a15d842 FD |
45 | _GLIBCXX_BEGIN_NAMESPACE_VERSION |
46 | ||
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47 | namespace experimental |
48 | { | |
49 | inline namespace fundamentals_v1 | |
50 | { | |
3c732e6f | 51 | // See C++14 20.4.2.5, tuple helper classes |
6b17203a VV |
52 | template <typename _Tp> |
53 | constexpr size_t tuple_size_v = tuple_size<_Tp>::value; | |
22274fac | 54 | |
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55 | #define __cpp_lib_experimental_tuple 201402 |
56 | ||
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57 | template <typename _Fn, typename _Tuple, std::size_t... _Idx> |
58 | constexpr decltype(auto) | |
3e9f67e6 | 59 | __apply_impl(_Fn&& __f, _Tuple&& __t, std::index_sequence<_Idx...>) |
ac68f97c | 60 | { |
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61 | return std::__invoke(std::forward<_Fn>(__f), |
62 | std::get<_Idx>(std::forward<_Tuple>(__t))...); | |
ac68f97c | 63 | } |
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64 | |
65 | template <typename _Fn, typename _Tuple> | |
66 | constexpr decltype(auto) | |
3e9f67e6 | 67 | apply(_Fn&& __f, _Tuple&& __t) |
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68 | { |
69 | using _Indices = | |
3e9f67e6 | 70 | std::make_index_sequence<tuple_size_v<std::decay_t<_Tuple>>>; |
285ee2fb JW |
71 | return experimental::__apply_impl(std::forward<_Fn>(__f), |
72 | std::forward<_Tuple>(__t), | |
73 | _Indices{}); | |
22274fac | 74 | } |
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75 | } // namespace fundamentals_v1 |
76 | } // namespace experimental | |
4a15d842 FD |
77 | |
78 | _GLIBCXX_END_NAMESPACE_VERSION | |
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79 | } // namespace std |
80 | ||
81 | #endif // C++14 | |
82 | ||
83 | #endif // _GLIBCXX_EXPERIMENTAL_TUPLE |