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The C and C++ Include Header Files

/usr/include/c++/11/experimental/tuple


$ cat -n /usr/include/c++/11/experimental/tuple

     1	// <experimental/tuple> -*- C++ -*-
     2	
     3	// Copyright (C) 2014-2021 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	 *  @ingroup libfund-ts
    28	 */
    29	
    30	#ifndef _GLIBCXX_EXPERIMENTAL_TUPLE
    31	#define _GLIBCXX_EXPERIMENTAL_TUPLE 1
    32	
    33	#pragma GCC system_header
    34	
    35	#if __cplusplus >= 201402L
    36	
    37	#include <tuple>
    38	#include <bits/invoke.h>
    39	#include <experimental/bits/lfts_config.h>
    40	
    41	namespace std _GLIBCXX_VISIBILITY(default)
    42	{
    43	_GLIBCXX_BEGIN_NAMESPACE_VERSION
    44	
    45	namespace experimental
    46	{
    47	inline namespace fundamentals_v1
    48	{
    49	  // See C++14 20.4.2.5, tuple helper classes
    50	  template <typename _Tp>
    51	    constexpr size_t tuple_size_v = tuple_size<_Tp>::value;
    52	
    53	#define __cpp_lib_experimental_tuple 201402
    54	
    55	  template <typename _Fn, typename _Tuple, std::size_t... _Idx>
    56	    constexpr decltype(auto)
    57	    __apply_impl(_Fn&& __f, _Tuple&& __t, std::index_sequence<_Idx...>)
    58	    {
    59	      return std::__invoke(std::forward<_Fn>(__f),
    60				   std::get<_Idx>(std::forward<_Tuple>(__t))...);
    61	    }
    62	
    63	  template <typename _Fn, typename _Tuple>
    64	    constexpr decltype(auto)
    65	    apply(_Fn&& __f, _Tuple&& __t)
    66	    {
    67	      using _Indices =
    68		std::make_index_sequence<tuple_size_v<std::decay_t<_Tuple>>>;
    69	      return experimental::__apply_impl(std::forward<_Fn>(__f),
    70						std::forward<_Tuple>(__t),
    71						_Indices{});
    72	    }
    73	} // namespace fundamentals_v1
    74	} // namespace experimental
    75	
    76	_GLIBCXX_END_NAMESPACE_VERSION
    77	} // namespace std
    78	
    79	#endif // C++14
    80	
    81	#endif // _GLIBCXX_EXPERIMENTAL_TUPLE