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The C and C++ Include Header Files

/usr/include/c++/13/tr1/utility


$ cat -n /usr/include/c++/13/tr1/utility

     1	// TR1 utility -*- C++ -*-
     2	
     3	// Copyright (C) 2004-2023 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 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	#pragma GCC system_header
    33	
    34	#include <bits/requires_hosted.h> // TR1
    35	
    36	#include <bits/c++config.h>
    37	#include <bits/stl_relops.h>
    38	#include <bits/stl_pair.h>
    39	
    40	namespace std _GLIBCXX_VISIBILITY(default)
    41	{
    42	_GLIBCXX_BEGIN_NAMESPACE_VERSION
    43	
    44	namespace tr1
    45	{
    46	  template<class _Tp>
    47	    class tuple_size;
    48	
    49	  template<int _Int, class _Tp>
    50	    class tuple_element;
    51	
    52	   // Various functions which give std::pair a tuple-like interface.
    53	  template<class _Tp1, class _Tp2>
    54	    struct tuple_size<std::pair<_Tp1, _Tp2> >
    55	    { static const int value = 2; };
    56	
    57	  template<class _Tp1, class _Tp2>
    58	    const int
    59	    tuple_size<std::pair<_Tp1, _Tp2> >::value;
    60	
    61	  template<class _Tp1, class _Tp2>
    62	    struct tuple_element<0, std::pair<_Tp1, _Tp2> >
    63	    { typedef _Tp1 type; };
    64	 
    65	  template<class _Tp1, class _Tp2>
    66	    struct tuple_element<1, std::pair<_Tp1, _Tp2> >
    67	    { typedef _Tp2 type; };
    68	
    69	  template<int _Int>
    70	    struct __pair_get;
    71	
    72	  template<>
    73	    struct __pair_get<0>
    74	    {
    75	      template<typename _Tp1, typename _Tp2>
    76	      static _Tp1& __get(std::pair<_Tp1, _Tp2>& __pair)
    77	      { return __pair.first; }
    78	
    79	      template<typename _Tp1, typename _Tp2>
    80	      static const _Tp1& __const_get(const std::pair<_Tp1, _Tp2>& __pair)
    81	      { return __pair.first; }
    82	    };
    83	
    84	  template<>
    85	    struct __pair_get<1>
    86	    {
    87	      template<typename _Tp1, typename _Tp2>
    88	      static _Tp2& __get(std::pair<_Tp1, _Tp2>& __pair)
    89	      { return __pair.second; }
    90	
    91	      template<typename _Tp1, typename _Tp2>
    92	      static const _Tp2& __const_get(const std::pair<_Tp1, _Tp2>& __pair)
    93	      { return __pair.second; }
    94	    };
    95	
    96	  template<int _Int, class _Tp1, class _Tp2>
    97	    inline typename tuple_element<_Int, std::pair<_Tp1, _Tp2> >::type&
    98	    get(std::pair<_Tp1, _Tp2>& __in)
    99	    { return __pair_get<_Int>::__get(__in); }
   100	
   101	  template<int _Int, class _Tp1, class _Tp2>
   102	    inline const typename tuple_element<_Int, std::pair<_Tp1, _Tp2> >::type&
   103	    get(const std::pair<_Tp1, _Tp2>& __in)
   104	    { return __pair_get<_Int>::__const_get(__in); }
   105	}
   106	
   107	_GLIBCXX_END_NAMESPACE_VERSION
   108	}
   109	
   110	#endif // _GLIBCXX_TR1_UTILITY