// Boost.Bimap
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//
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// Copyright (c) 2006-2007 Matias Capeletto
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//
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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/// \file relation/support/get_pair_functor.hpp
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/// \brief get_pair_functor definition
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#ifndef BOOST_BIMAP_RELATION_SUPPORT_GET_PAIR_FUNCTOR_HPP
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#define BOOST_BIMAP_RELATION_SUPPORT_GET_PAIR_FUNCTOR_HPP
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#if defined(_MSC_VER)
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#pragma once
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#endif
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#include <boost/config.hpp>
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#include <boost/bimap/relation/support/pair_by.hpp>
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namespace boost {
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namespace bimaps {
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namespace relation {
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namespace support {
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/// \brief A Functor that takes a relation as a parameter an return the desired view.
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/**
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This functor is included to help users of the relation class when using
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stl algorithms.
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See also member_at, pair_by().
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\ingroup relation_group
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**/
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template< class Tag, class Relation >
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struct get_pair_functor
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{
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BOOST_DEDUCED_TYPENAME result_of::pair_by<Tag,Relation>::type
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operator()( Relation & r ) const
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{
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return pair_by<Tag>(r);
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}
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BOOST_DEDUCED_TYPENAME result_of::pair_by<Tag,const Relation>::type
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operator()( const Relation & r ) const
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{
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return pair_by<Tag>(r);
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}
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};
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/// \brief A Functor that takes a relation as a parameter an return the above view.
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/**
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\ingroup relation_group
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**/
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template< class Relation >
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struct get_above_view_functor
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{
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BOOST_DEDUCED_TYPENAME Relation::above_view &
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operator()( Relation & r ) const
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{
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return r.get_view();
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}
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const BOOST_DEDUCED_TYPENAME Relation::above_view &
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operator()( const Relation & r ) const
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{
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return r.get_view();
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}
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};
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} // namespace support
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} // namespace relation
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} // namespace bimaps
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} // namespace boost
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#endif // BOOST_BIMAP_RELATION_SUPPORT_GET_PAIR_FUNCTOR_HPP
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