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// -*- C++ -*-

// Copyright (C) 2005 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 2, 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.

// You should have received a copy of the GNU General Public License along

// with this library; see the file COPYING.  If not, write to the Free

// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,

// USA.

// As a special exception, you may use this file as part of a free software

// library without restriction.  Specifically, if other files instantiate

// templates or use macros or inline functions from this file, or you compile

// this file and link it with other files to produce an executable, this

// file does not by itself cause the resulting executable to be covered by

// the GNU General Public License.  This exception does not however

// invalidate any other reasons why the executable file might be covered by

// the GNU General Public License.

// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.

// 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 EQ_BY_LESS_HPP

#define EQ_BY_LESS_HPP

#include <utility>

#include <functional>

#include <vector>

#include <assert.h>

#include <ext/pb_assoc/detail/types_traits.hpp>

namespace pb_assoc

{

  namespace detail

  {

#include <functional>

    template<typename Key, class Cmp_Fn>

    struct eq_by_less : public std::binary_function<const Key& , const Key& , bool>,

                        protected Cmp_Fn

    {

      bool

      operator()(const Key& r_lhs, const Key& r_rhs) const

      {

        return (!(Cmp_Fn::operator()(r_lhs, r_rhs)&&

                  !(Cmp_Fn::operator()(r_rhs, r_lhs))));

      }

    };

  } // namespace detail

} // namespace pb_assoc

#endif // #ifndef EQ_BY_LESS_HPP