/* Copyright 2003-2005 Joaquín M López Muñoz.

 * Distributed under the Boost Software License, Version 1.0.

 * (See accompanying file LICENSE_1_0.txt or copy at

 * http://www.boost.org/LICENSE_1_0.txt)

 *

 * See http://www.boost.org/libs/multi_index for library home page.

 */

#ifndef BOOST_MULTI_INDEX_DETAIL_VALUE_COMPARE_HPP

#define BOOST_MULTI_INDEX_DETAIL_VALUE_COMPARE_HPP

#if defined(_MSC_VER)&&(_MSC_VER>=1200)

#pragma once

#endif

#include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */

#include <boost/call_traits.hpp>

#include <functional>

namespace boost{

namespace multi_index{

namespace detail{

template<typename Value,typename KeyFromValue,typename Compare>

struct value_comparison:std::binary_function<Value,Value,bool>

{

  value_comparison(KeyFromValue key_=KeyFromValue(),Compare comp_=Compare()):

    key(key_),comp(comp_)

  {

  }

  bool operator()(

    typename call_traits<Value>::param_type x,

    typename call_traits<Value>::param_type y)const

  {

    return comp(key(x),key(y));

  }

private:

  KeyFromValue key;

  Compare      comp;

};

} /* namespace multi_index::detail */

} /* namespace multi_index */

} /* namespace boost */

#endif