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tuple revision 1.1.1.4 
      1 // <experimental/tuple> -*- C++ -*-
      2 
      3 // Copyright (C) 2014-2016 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 <= 201103L
     35 # include <bits/c++14_warning.h>
     36 #else
     37 
     38 #include <tuple>
     39 #include <functional>
     40 #include <experimental/bits/lfts_config.h>
     41 
     42 namespace std _GLIBCXX_VISIBILITY(default)
     43 {
     44 namespace experimental
     45 {
     46 inline namespace fundamentals_v1
     47 {
     48 _GLIBCXX_BEGIN_NAMESPACE_VERSION
     49 
     50   // See C++14 20.4.2.5, tuple helper classes
     51   template <typename _Tp>
     52     constexpr size_t tuple_size_v = tuple_size<_Tp>::value;
     53 
     54 #define __cpp_lib_experimental_tuple 201402
     55 
     56   template <typename _Fn, typename _Tuple, std::size_t... _Idx>
     57     constexpr decltype(auto)
     58     __apply_impl(_Fn&& f, _Tuple&& t, std::index_sequence<_Idx...>)
     59     {
     60       using _Wrap = _Maybe_wrap_member_pointer<decay_t<_Fn>>;
     61       return _Wrap::__do_wrap(std::forward<_Fn>(f))(
     62 	  std::get<_Idx>(std::forward<_Tuple>(t))...);
     63     }
     64 
     65   template <typename _Fn, typename _Tuple>
     66     constexpr decltype(auto)
     67     apply(_Fn&& f, _Tuple&& t)
     68     {
     69       using _Indices =
     70 	std::make_index_sequence<std::tuple_size<std::decay_t<_Tuple>>::value>;
     71       return __apply_impl(std::forward<_Fn>(f), std::forward<_Tuple>(t),
     72 			  _Indices{});
     73     }
     74 
     75 _GLIBCXX_END_NAMESPACE_VERSION
     76 } // namespace fundamentals_v1
     77 } // namespace experimental
     78 } // namespace std
     79 
     80 #endif // C++14
     81 
     82 #endif // _GLIBCXX_EXPERIMENTAL_TUPLE
     83