1// Boost.Bimap
2//
3// Copyright (c) 2006-2007 Matias Capeletto
4//
5// Distributed under the Boost Software License, Version 1.0.
6// (See accompanying file LICENSE_1_0.txt or copy at
7// http://www.boost.org/LICENSE_1_0.txt)
8
9/// \file relation/support/get_pair_functor.hpp
10/// \brief get_pair_functor definition
11
12#ifndef BOOST_BIMAP_RELATION_SUPPORT_GET_PAIR_FUNCTOR_HPP
13#define BOOST_BIMAP_RELATION_SUPPORT_GET_PAIR_FUNCTOR_HPP
14
15#if defined(_MSC_VER)
16#pragma once
17#endif
18
19#include <boost/config.hpp>
20
21#include <boost/bimap/relation/support/pair_by.hpp>
22
23namespace boost {
24namespace bimaps {
25namespace relation {
26namespace support {
27
28/// \brief A Functor that takes a relation as a parameter an return the desired view.
29/**
30
31This functor is included to help users of the relation class when using
32stl algorithms.
33
34See also member_at, pair_by().
35\ingroup relation_group
36
37 **/
38
39template< class Tag, class Relation >
40struct get_pair_functor
41{
42 BOOST_DEDUCED_TYPENAME result_of::pair_by<Tag,Relation>::type
43 operator()( Relation & r ) const
44 {
45 return pair_by<Tag>(r);
46 }
47
48 BOOST_DEDUCED_TYPENAME result_of::pair_by<Tag,const Relation>::type
49 operator()( const Relation & r ) const
50 {
51 return pair_by<Tag>(r);
52 }
53};
54
55
56/// \brief A Functor that takes a relation as a parameter an return the above view.
57/**
58
59\ingroup relation_group
60 **/
61
62template< class Relation >
63struct get_above_view_functor
64{
65 BOOST_DEDUCED_TYPENAME Relation::above_view &
66 operator()( Relation & r ) const
67 {
68 return r.get_view();
69 }
70
71 const BOOST_DEDUCED_TYPENAME Relation::above_view &
72 operator()( const Relation & r ) const
73 {
74 return r.get_view();
75 }
76};
77
78} // namespace support
79} // namespace relation
80} // namespace bimaps
81} // namespace boost
82
83
84#endif // BOOST_BIMAP_RELATION_SUPPORT_GET_PAIR_FUNCTOR_HPP
85
86

source code of boost/libs/bimap/include/boost/bimap/relation/support/get_pair_functor.hpp