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Editing: eq_by_less.hpp

// -*- C++ -*-

// Copyright (C) 2005, 2006, 2009 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the terms
// of the GNU General Public License as published by the Free Software
// Foundation; either version 3, or (at your option) any later
// version.

// This library is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// General Public License for more details.

// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
// <http://www.gnu.org/licenses/>.

// Permission to use, copy, modify, sell, and distribute this software
// is hereby granted without fee, provided that the above copyright
// notice appears in all copies, and that both that copyright notice
// and this permission notice appear in supporting documentation. None
// of the above authors, nor IBM Haifa Research Laboratories, make any
// representation about the suitability of this software for any
// purpose. It is provided "as is" without express or implied
// warranty.

/**
 * @file eq_by_less.hpp
 * Contains an equivalence function.
 */

#ifndef PB_DS_EQ_BY_LESS_HPP
#define PB_DS_EQ_BY_LESS_HPP

#include <utility>
#include <functional>
#include <vector>
#include <assert.h>
#include <ext/pb_ds/detail/types_traits.hpp>

namespace __gnu_pbds
{
  namespace detail
  {
    template<typename Key, class Cmp_Fn>
    struct eq_by_less : private Cmp_Fn
    {
      bool
      operator()(const Key& r_lhs, const Key& r_rhs) const
      {
	const bool l = Cmp_Fn::operator()(r_lhs, r_rhs);
	const bool g = Cmp_Fn::operator()(r_rhs, r_lhs);
	return !(l || g);
      }
    };
  } // namespace detail
} // namespace __gnu_pbds

#endif // #ifndef PB_DS_EQ_BY_LESS_HPP

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