/* 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