The C and C++ Include Header Files

/usr/include/c++/11/ext/pb_ds/detail/eq_fn/eq_by_less.hpp


$ cat -n /usr/include/c++/11/ext/pb_ds/detail/eq_fn/eq_by_less.hpp

     1	// -*- C++ -*-
     2	
     3	// Copyright (C) 2005-2021 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 terms
     7	// of the GNU General Public License as published by the Free Software
     8	// Foundation; either version 3, or (at your option) any later
     9	// version.
    10	
    11	// This library is distributed in the hope that it will be useful, but
    12	// WITHOUT ANY WARRANTY; without even the implied warranty of
    13	// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    14	// 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	// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
    26	
    27	// Permission to use, copy, modify, sell, and distribute this software
    28	// is hereby granted without fee, provided that the above copyright
    29	// notice appears in all copies, and that both that copyright notice
    30	// and this permission notice appear in supporting documentation. None
    31	// of the above authors, nor IBM Haifa Research Laboratories, make any
    32	// representation about the suitability of this software for any
    33	// purpose. It is provided "as is" without express or implied
    34	// warranty.
    35	
    36	/**
    37	 * @file eq_by_less.hpp
    38	 * Contains an equivalence function.
    39	 */
    40	
    41	#ifndef PB_DS_EQ_BY_LESS_HPP
    42	#define PB_DS_EQ_BY_LESS_HPP
    43	
    44	#include <utility>
    45	#include <functional>
    46	#include <vector>
    47	#include <assert.h>
    48	#include <ext/pb_ds/detail/types_traits.hpp>
    49	
    50	namespace __gnu_pbds
    51	{
    52	  namespace detail
    53	  {
    54	    /// Equivalence function.
    55	    template<typename Key, class Cmp_Fn>
    56	    struct eq_by_less : private Cmp_Fn
    57	    {
    58	      bool
    59	      operator()(const Key& r_lhs, const Key& r_rhs) const
    60	      {
    61		const bool l = Cmp_Fn::operator()(r_lhs, r_rhs);
    62		const bool g = Cmp_Fn::operator()(r_rhs, r_lhs);
    63		return !(l || g);
    64	      }
    65	    };
    66	  } // namespace detail
    67	} // namespace __gnu_pbds
    68	
    69	#endif // #ifndef PB_DS_EQ_BY_LESS_HPP