value_compare.hpp

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/* Copyright 2003-2015 Joaquin M Lopez Munoz.
 * 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)
#pragma once
#endif
 
#include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */
#include <boost/call_traits.hpp>
 
namespace boost{
 
namespace multi_index{
 
namespace detail{
 
template<typename Value,typename KeyFromValue,typename Compare>
struct value_comparison
{
  typedef Value first_argument_type;
  typedef Value second_argument_type;
  typedef bool  result_type;
 
  value_comparison(
    const KeyFromValue& key_=KeyFromValue(),const 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