1*38fd1498Szrj// <experimental/tuple> -*- C++ -*- 2*38fd1498Szrj 3*38fd1498Szrj// Copyright (C) 2014-2018 Free Software Foundation, Inc. 4*38fd1498Szrj// 5*38fd1498Szrj// This file is part of the GNU ISO C++ Library. This library is free 6*38fd1498Szrj// software; you can redistribute it and/or modify it under the 7*38fd1498Szrj// terms of the GNU General Public License as published by the 8*38fd1498Szrj// Free Software Foundation; either version 3, or (at your option) 9*38fd1498Szrj// any later version. 10*38fd1498Szrj 11*38fd1498Szrj// This library is distributed in the hope that it will be useful, 12*38fd1498Szrj// but WITHOUT ANY WARRANTY; without even the implied warranty of 13*38fd1498Szrj// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14*38fd1498Szrj// GNU General Public License for more details. 15*38fd1498Szrj 16*38fd1498Szrj// Under Section 7 of GPL version 3, you are granted additional 17*38fd1498Szrj// permissions described in the GCC Runtime Library Exception, version 18*38fd1498Szrj// 3.1, as published by the Free Software Foundation. 19*38fd1498Szrj 20*38fd1498Szrj// You should have received a copy of the GNU General Public License and 21*38fd1498Szrj// a copy of the GCC Runtime Library Exception along with this program; 22*38fd1498Szrj// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23*38fd1498Szrj// <http://www.gnu.org/licenses/>. 24*38fd1498Szrj 25*38fd1498Szrj/** @file experimental/tuple 26*38fd1498Szrj * This is a TS C++ Library header. 27*38fd1498Szrj */ 28*38fd1498Szrj 29*38fd1498Szrj#ifndef _GLIBCXX_EXPERIMENTAL_TUPLE 30*38fd1498Szrj#define _GLIBCXX_EXPERIMENTAL_TUPLE 1 31*38fd1498Szrj 32*38fd1498Szrj#pragma GCC system_header 33*38fd1498Szrj 34*38fd1498Szrj#if __cplusplus >= 201402L 35*38fd1498Szrj 36*38fd1498Szrj#include <tuple> 37*38fd1498Szrj#include <bits/invoke.h> 38*38fd1498Szrj#include <experimental/bits/lfts_config.h> 39*38fd1498Szrj 40*38fd1498Szrjnamespace std _GLIBCXX_VISIBILITY(default) 41*38fd1498Szrj{ 42*38fd1498Szrj_GLIBCXX_BEGIN_NAMESPACE_VERSION 43*38fd1498Szrj 44*38fd1498Szrjnamespace experimental 45*38fd1498Szrj{ 46*38fd1498Szrjinline namespace fundamentals_v1 47*38fd1498Szrj{ 48*38fd1498Szrj // See C++14 §20.4.2.5, tuple helper classes 49*38fd1498Szrj template <typename _Tp> 50*38fd1498Szrj constexpr size_t tuple_size_v = tuple_size<_Tp>::value; 51*38fd1498Szrj 52*38fd1498Szrj#define __cpp_lib_experimental_tuple 201402 53*38fd1498Szrj 54*38fd1498Szrj template <typename _Fn, typename _Tuple, std::size_t... _Idx> 55*38fd1498Szrj constexpr decltype(auto) 56*38fd1498Szrj __apply_impl(_Fn&& __f, _Tuple&& __t, std::index_sequence<_Idx...>) 57*38fd1498Szrj { 58*38fd1498Szrj return std::__invoke(std::forward<_Fn>(__f), 59*38fd1498Szrj std::get<_Idx>(std::forward<_Tuple>(__t))...); 60*38fd1498Szrj } 61*38fd1498Szrj 62*38fd1498Szrj template <typename _Fn, typename _Tuple> 63*38fd1498Szrj constexpr decltype(auto) 64*38fd1498Szrj apply(_Fn&& __f, _Tuple&& __t) 65*38fd1498Szrj { 66*38fd1498Szrj using _Indices = 67*38fd1498Szrj std::make_index_sequence<tuple_size_v<std::decay_t<_Tuple>>>; 68*38fd1498Szrj return experimental::__apply_impl(std::forward<_Fn>(__f), 69*38fd1498Szrj std::forward<_Tuple>(__t), 70*38fd1498Szrj _Indices{}); 71*38fd1498Szrj } 72*38fd1498Szrj} // namespace fundamentals_v1 73*38fd1498Szrj} // namespace experimental 74*38fd1498Szrj 75*38fd1498Szrj_GLIBCXX_END_NAMESPACE_VERSION 76*38fd1498Szrj} // namespace std 77*38fd1498Szrj 78*38fd1498Szrj#endif // C++14 79*38fd1498Szrj 80*38fd1498Szrj#endif // _GLIBCXX_EXPERIMENTAL_TUPLE 81