libstdc++
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00001 // <experimental/tuple> -*- C++ -*- 00002 00003 // Copyright (C) 2014-2017 Free Software Foundation, Inc. 00004 // 00005 // This file is part of the GNU ISO C++ Library. This library is free 00006 // software; you can redistribute it and/or modify it under the 00007 // terms of the GNU General Public License as published by the 00008 // Free Software Foundation; either version 3, or (at your option) 00009 // any later version. 00010 00011 // This library is distributed in the hope that it will be useful, 00012 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00014 // GNU General Public License for more details. 00015 00016 // Under Section 7 of GPL version 3, you are granted additional 00017 // permissions described in the GCC Runtime Library Exception, version 00018 // 3.1, as published by the Free Software Foundation. 00019 00020 // You should have received a copy of the GNU General Public License and 00021 // a copy of the GCC Runtime Library Exception along with this program; 00022 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 00023 // <http://www.gnu.org/licenses/>. 00024 00025 /** @file experimental/tuple 00026 * This is a TS C++ Library header. 00027 */ 00028 00029 #ifndef _GLIBCXX_EXPERIMENTAL_TUPLE 00030 #define _GLIBCXX_EXPERIMENTAL_TUPLE 1 00031 00032 #pragma GCC system_header 00033 00034 #if __cplusplus <= 201103L 00035 # include <bits/c++14_warning.h> 00036 #else 00037 00038 #include <tuple> 00039 #include <bits/invoke.h> 00040 #include <experimental/bits/lfts_config.h> 00041 00042 namespace std _GLIBCXX_VISIBILITY(default) 00043 { 00044 namespace experimental 00045 { 00046 inline namespace fundamentals_v1 00047 { 00048 _GLIBCXX_BEGIN_NAMESPACE_VERSION 00049 00050 // See C++14 ยง20.4.2.5, tuple helper classes 00051 template <typename _Tp> 00052 constexpr size_t tuple_size_v = tuple_size<_Tp>::value; 00053 00054 #define __cpp_lib_experimental_tuple 201402 00055 00056 template <typename _Fn, typename _Tuple, std::size_t... _Idx> 00057 constexpr decltype(auto) 00058 __apply_impl(_Fn&& __f, _Tuple&& __t, std::index_sequence<_Idx...>) 00059 { 00060 return std::__invoke(std::forward<_Fn>(__f), 00061 std::get<_Idx>(std::forward<_Tuple>(__t))...); 00062 } 00063 00064 template <typename _Fn, typename _Tuple> 00065 constexpr decltype(auto) 00066 apply(_Fn&& __f, _Tuple&& __t) 00067 { 00068 using _Indices = 00069 std::make_index_sequence<tuple_size_v<std::decay_t<_Tuple>>>; 00070 return experimental::__apply_impl(std::forward<_Fn>(__f), 00071 std::forward<_Tuple>(__t), 00072 _Indices{}); 00073 } 00074 00075 _GLIBCXX_END_NAMESPACE_VERSION 00076 } // namespace fundamentals_v1 00077 } // namespace experimental 00078 } // namespace std 00079 00080 #endif // C++14 00081 00082 #endif // _GLIBCXX_EXPERIMENTAL_TUPLE