Where Online Learning is simpler!

The C and C++ Include Header Files

/usr/include/c++/13/experimental/tuple


$ cat -n /usr/include/c++/13/experimental/tuple

     1	// <experimental/tuple> -*- C++ -*-
     2	
     3	// Copyright (C) 2014-2023 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	#include <bits/requires_hosted.h> // experimental is currently omitted
    36	
    37	#if __cplusplus >= 201402L
    38	
    39	#include <tuple>
    40	#include <bits/invoke.h>
    41	#include <experimental/bits/lfts_config.h>
    42	
    43	namespace std _GLIBCXX_VISIBILITY(default)
    44	{
    45	_GLIBCXX_BEGIN_NAMESPACE_VERSION
    46	
    47	namespace experimental
    48	{
    49	inline namespace fundamentals_v1
    50	{
    51	  // See C++14 20.4.2.5, tuple helper classes
    52	  template <typename _Tp>
    53	    constexpr size_t tuple_size_v = tuple_size<_Tp>::value;
    54	
    55	#define __cpp_lib_experimental_tuple 201402
    56	
    57	  template <typename _Fn, typename _Tuple, std::size_t... _Idx>
    58	    constexpr decltype(auto)
    59	    __apply_impl(_Fn&& __f, _Tuple&& __t, std::index_sequence<_Idx...>)
    60	    {
    61	      return std::__invoke(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<tuple_size_v<std::decay_t<_Tuple>>>;
    71	      return experimental::__apply_impl(std::forward<_Fn>(__f),
    72						std::forward<_Tuple>(__t),
    73						_Indices{});
    74	    }
    75	} // namespace fundamentals_v1
    76	} // namespace experimental
    77	
    78	_GLIBCXX_END_NAMESPACE_VERSION
    79	} // namespace std
    80	
    81	#endif // C++14
    82	
    83	#endif // _GLIBCXX_EXPERIMENTAL_TUPLE