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The C and C++ Include Header Files

cat -n /usr/include/c++/15/tr1/utility

     1	// TR1 utility -*- C++ -*-
     2	
     3	// Copyright (C) 2004-2025 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 tr1/utility
    26	 *  This is a TR1 C++ Library header. 
    27	 */
    28	
    29	#ifndef _GLIBCXX_TR1_UTILITY
    30	#define _GLIBCXX_TR1_UTILITY 1
    31	
    32	#ifdef _GLIBCXX_SYSHDR
    33	#pragma GCC system_header
    34	#endif
    35	
    36	#include <bits/requires_hosted.h> // TR1
    37	
    38	#include <bits/c++config.h>
    39	#include <bits/stl_relops.h>
    40	#include <bits/stl_pair.h>
    41	
    42	namespace std _GLIBCXX_VISIBILITY(default)
    43	{
    44	_GLIBCXX_BEGIN_NAMESPACE_VERSION
    45	
    46	namespace tr1
    47	{
    48	  template<class _Tp>
    49	    class tuple_size;
    50	
    51	  template<int _Int, class _Tp>
    52	    class tuple_element;
    53	
    54	   // Various functions which give std::pair a tuple-like interface.
    55	  template<class _Tp1, class _Tp2>
    56	    struct tuple_size<std::pair<_Tp1, _Tp2> >
    57	    { static const int value = 2; };
    58	
    59	  template<class _Tp1, class _Tp2>
    60	    const int
    61	    tuple_size<std::pair<_Tp1, _Tp2> >::value;
    62	
    63	  template<class _Tp1, class _Tp2>
    64	    struct tuple_element<0, std::pair<_Tp1, _Tp2> >
    65	    { typedef _Tp1 type; };
    66	 
    67	  template<class _Tp1, class _Tp2>
    68	    struct tuple_element<1, std::pair<_Tp1, _Tp2> >
    69	    { typedef _Tp2 type; };
    70	
    71	  template<int _Int>
    72	    struct __pair_get;
    73	
    74	  template<>
    75	    struct __pair_get<0>
    76	    {
    77	      template<typename _Tp1, typename _Tp2>
    78	      static _Tp1& __get(std::pair<_Tp1, _Tp2>& __pair)
    79	      { return __pair.first; }
    80	
    81	      template<typename _Tp1, typename _Tp2>
    82	      static const _Tp1& __const_get(const std::pair<_Tp1, _Tp2>& __pair)
    83	      { return __pair.first; }
    84	    };
    85	
    86	  template<>
    87	    struct __pair_get<1>
    88	    {
    89	      template<typename _Tp1, typename _Tp2>
    90	      static _Tp2& __get(std::pair<_Tp1, _Tp2>& __pair)
    91	      { return __pair.second; }
    92	
    93	      template<typename _Tp1, typename _Tp2>
    94	      static const _Tp2& __const_get(const std::pair<_Tp1, _Tp2>& __pair)
    95	      { return __pair.second; }
    96	    };
    97	
    98	  template<int _Int, class _Tp1, class _Tp2>
    99	    inline typename tuple_element<_Int, std::pair<_Tp1, _Tp2> >::type&
   100	    get(std::pair<_Tp1, _Tp2>& __in)
   101	    { return __pair_get<_Int>::__get(__in); }
   102	
   103	  template<int _Int, class _Tp1, class _Tp2>
   104	    inline const typename tuple_element<_Int, std::pair<_Tp1, _Tp2> >::type&
   105	    get(const std::pair<_Tp1, _Tp2>& __in)
   106	    { return __pair_get<_Int>::__const_get(__in); }
   107	}
   108	
   109	_GLIBCXX_END_NAMESPACE_VERSION
   110	}
   111	
   112	#endif // _GLIBCXX_TR1_UTILITY