libstdc++
tuple
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00001 // <experimental/tuple> -*- C++ -*-
00002 
00003 // Copyright (C) 2014-2018 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 >= 201402L
00035 
00036 #include <tuple>
00037 #include <bits/invoke.h>
00038 #include <experimental/bits/lfts_config.h>
00039 
00040 namespace std _GLIBCXX_VISIBILITY(default)
00041 {
00042 _GLIBCXX_BEGIN_NAMESPACE_VERSION
00043 
00044 namespace experimental
00045 {
00046 inline namespace fundamentals_v1
00047 {
00048   // See C++14 ยง20.4.2.5, tuple helper classes
00049   template <typename _Tp>
00050     constexpr size_t tuple_size_v = tuple_size<_Tp>::value;
00051 
00052 #define __cpp_lib_experimental_tuple 201402
00053 
00054   template <typename _Fn, typename _Tuple, std::size_t... _Idx>
00055     constexpr decltype(auto)
00056     __apply_impl(_Fn&& __f, _Tuple&& __t, std::index_sequence<_Idx...>)
00057     {
00058       return std::__invoke(std::forward<_Fn>(__f),
00059                            std::get<_Idx>(std::forward<_Tuple>(__t))...);
00060     }
00061 
00062   template <typename _Fn, typename _Tuple>
00063     constexpr decltype(auto)
00064     apply(_Fn&& __f, _Tuple&& __t)
00065     {
00066       using _Indices =
00067         std::make_index_sequence<tuple_size_v<std::decay_t<_Tuple>>>;
00068       return experimental::__apply_impl(std::forward<_Fn>(__f),
00069                                         std::forward<_Tuple>(__t),
00070                                         _Indices{});
00071     }
00072 } // namespace fundamentals_v1
00073 } // namespace experimental
00074 
00075 _GLIBCXX_END_NAMESPACE_VERSION
00076 } // namespace std
00077 
00078 #endif // C++14
00079 
00080 #endif // _GLIBCXX_EXPERIMENTAL_TUPLE