1 | /* Copyright 2003-2015 Joaquin M Lopez Munoz. |
2 | * Distributed under the Boost Software License, Version 1.0. |
3 | * (See accompanying file LICENSE_1_0.txt or copy at |
4 | * http://www.boost.org/LICENSE_1_0.txt) |
5 | * |
6 | * See http://www.boost.org/libs/multi_index for library home page. |
7 | */ |
8 | |
9 | #ifndef BOOST_MULTI_INDEX_DETAIL_VALUE_COMPARE_HPP |
10 | #define BOOST_MULTI_INDEX_DETAIL_VALUE_COMPARE_HPP |
11 | |
12 | #if defined(_MSC_VER) |
13 | #pragma once |
14 | #endif |
15 | |
16 | #include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */ |
17 | #include <boost/call_traits.hpp> |
18 | |
19 | namespace boost{ |
20 | |
21 | namespace multi_index{ |
22 | |
23 | namespace detail{ |
24 | |
25 | template<typename Value,typename KeyFromValue,typename Compare> |
26 | struct value_comparison |
27 | { |
28 | typedef Value first_argument_type; |
29 | typedef Value second_argument_type; |
30 | typedef bool result_type; |
31 | |
32 | value_comparison( |
33 | const KeyFromValue& key_=KeyFromValue(),const Compare& comp_=Compare()): |
34 | key(key_),comp(comp_) |
35 | { |
36 | } |
37 | |
38 | bool operator()( |
39 | typename call_traits<Value>::param_type x, |
40 | typename call_traits<Value>::param_type y)const |
41 | { |
42 | return comp(key(x),key(y)); |
43 | } |
44 | |
45 | private: |
46 | KeyFromValue key; |
47 | Compare comp; |
48 | }; |
49 | |
50 | } /* namespace multi_index::detail */ |
51 | |
52 | } /* namespace multi_index */ |
53 | |
54 | } /* namespace boost */ |
55 | |
56 | #endif |
57 | |