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  1. // <experimental/tuple> -*- C++ -*-
  2.  
  3. // Copyright (C) 2014-2015 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.  
  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 ยง20.4.2.5, 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::forward<_Fn>(f)(std::get<_Idx>(std::forward<_Tuple>(t))...);
  59.     }
  60.  
  61.   template <typename _Fn, typename _Tuple>
  62.     constexpr decltype(auto)
  63.     apply(_Fn&& f, _Tuple&& t)
  64.     {
  65.       using _Indices =
  66.         std::make_index_sequence<std::tuple_size<std::decay_t<_Tuple>>::value>;
  67.       return __apply_impl(std::forward<_Fn>(f), std::forward<_Tuple>(t),
  68.                           _Indices{});
  69.     }
  70.  
  71. _GLIBCXX_END_NAMESPACE_VERSION
  72. } // namespace fundamentals_v1
  73. } // namespace experimental
  74. } // namespace std
  75.  
  76. #endif // C++14
  77.  
  78. #endif // _GLIBCXX_EXPERIMENTAL_TUPLE
  79.