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tuple revision 1.1.1.4.2.1 
      1 // <experimental/tuple> -*- C++ -*-
      2 
      3 // Copyright (C) 2014-2017 Free Software Foundation, Inc.
      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.
     27  */
     28 
     29 #ifndef _GLIBCXX_EXPERIMENTAL_TUPLE
     30 #define _GLIBCXX_EXPERIMENTAL_TUPLE 1
     31 
     32 #pragma GCC system_header
     33 
     34 #if __cplusplus >= 201402L
     35 
     36 #include <tuple>
     37 #include <bits/invoke.h>
     38 #include <experimental/bits/lfts_config.h>
     39 
     40 namespace std _GLIBCXX_VISIBILITY(default)
     41 {
     42 namespace experimental
     43 {
     44 inline namespace fundamentals_v1
     45 {
     46 _GLIBCXX_BEGIN_NAMESPACE_VERSION
     47 
     48   // See C++14 20.4.2.5, tuple helper classes
     49   template <typename _Tp>
     50     constexpr size_t tuple_size_v = tuple_size<_Tp>::value;
     51 
     52 #define __cpp_lib_experimental_tuple 201402
     53 
     54   template <typename _Fn, typename _Tuple, std::size_t... _Idx>
     55     constexpr decltype(auto)
     56     __apply_impl(_Fn&& __f, _Tuple&& __t, std::index_sequence<_Idx...>)
     57     {
     58       return std::__invoke(std::forward<_Fn>(__f),
     59 			   std::get<_Idx>(std::forward<_Tuple>(__t))...);
     60     }
     61 
     62   template <typename _Fn, typename _Tuple>
     63     constexpr decltype(auto)
     64     apply(_Fn&& __f, _Tuple&& __t)
     65     {
     66       using _Indices =
     67 	std::make_index_sequence<tuple_size_v<std::decay_t<_Tuple>>>;
     68       return experimental::__apply_impl(std::forward<_Fn>(__f),
     69 					std::forward<_Tuple>(__t),
     70 					_Indices{});
     71     }
     72 
     73 _GLIBCXX_END_NAMESPACE_VERSION
     74 } // namespace fundamentals_v1
     75 } // namespace experimental
     76 } // namespace std
     77 
     78 #endif // C++14
     79 
     80 #endif // _GLIBCXX_EXPERIMENTAL_TUPLE
     81