Chris@101: /* Copyright 2003-2013 Joaquin M Lopez Munoz.
Chris@16:  * Distributed under the Boost Software License, Version 1.0.
Chris@16:  * (See accompanying file LICENSE_1_0.txt or copy at
Chris@16:  * http://www.boost.org/LICENSE_1_0.txt)
Chris@16:  *
Chris@16:  * See http://www.boost.org/libs/multi_index for library home page.
Chris@16:  */
Chris@16: 
Chris@16: #ifndef BOOST_MULTI_INDEX_DETAIL_VALUE_COMPARE_HPP
Chris@16: #define BOOST_MULTI_INDEX_DETAIL_VALUE_COMPARE_HPP
Chris@16: 
Chris@101: #if defined(_MSC_VER)
Chris@16: #pragma once
Chris@16: #endif
Chris@16: 
Chris@16: #include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */
Chris@16: #include <boost/call_traits.hpp>
Chris@16: #include <functional>
Chris@16: 
Chris@16: namespace boost{
Chris@16: 
Chris@16: namespace multi_index{
Chris@16: 
Chris@16: namespace detail{
Chris@16: 
Chris@16: template<typename Value,typename KeyFromValue,typename Compare>
Chris@16: struct value_comparison:std::binary_function<Value,Value,bool>
Chris@16: {
Chris@16:   value_comparison(
Chris@16:     const KeyFromValue& key_=KeyFromValue(),const Compare& comp_=Compare()):
Chris@16:     key(key_),comp(comp_)
Chris@16:   {
Chris@16:   }
Chris@16: 
Chris@16:   bool operator()(
Chris@16:     typename call_traits<Value>::param_type x,
Chris@16:     typename call_traits<Value>::param_type y)const
Chris@16:   {
Chris@16:     return comp(key(x),key(y));
Chris@16:   }
Chris@16: 
Chris@16: private:
Chris@16:   KeyFromValue key;
Chris@16:   Compare      comp;
Chris@16: };
Chris@16: 
Chris@16: } /* namespace multi_index::detail */
Chris@16: 
Chris@16: } /* namespace multi_index */
Chris@16: 
Chris@16: } /* namespace boost */
Chris@16: 
Chris@16: #endif