// 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/data_extractor.hpp
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/// \brief Data extraction functor.
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#ifndef BOOST_BIMAP_RELATION_SUPPORT_DATA_EXTRACTOR_HPP
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#define BOOST_BIMAP_RELATION_SUPPORT_DATA_EXTRACTOR_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/detail/metadata_access_builder.hpp>
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/** \struct boost::bimaps::relation::support::data_extractor
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\brief Data extraction functor.
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\ingroup relation_group
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**/
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#ifndef BOOST_BIMAP_DOXYGEN_WILL_NOT_PROCESS_THE_FOLLOWING_LINES
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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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template< class Tag, class Relation >
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struct data_extractor_implementation;
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template< class Relation >
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struct data_extractor_implementation< member_at::left, Relation >
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{
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typedef Relation argument_type;
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typedef BOOST_DEDUCED_TYPENAME Relation::left_value_type result_type;
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BOOST_DEDUCED_TYPENAME Relation::left_value_type const &
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operator()(Relation const & rel) const
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{
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return rel.left;
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}
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BOOST_DEDUCED_TYPENAME Relation::left_value_type &
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operator()(Relation & rel) const
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{
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return rel.left;
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}
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};
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template< class Relation >
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struct data_extractor_implementation< member_at::right, Relation >
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{
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typedef Relation argument_type;
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typedef BOOST_DEDUCED_TYPENAME Relation::right_value_type result_type;
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BOOST_DEDUCED_TYPENAME Relation::right_value_type const &
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operator()(Relation const & rel) const
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{
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return rel.right;
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}
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BOOST_DEDUCED_TYPENAME Relation::right_value_type &
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operator()(Relation & rel) const
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{
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return rel.right;
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}
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};
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template< class Tag, class Relation >
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struct data_extractor
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{
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typedef data_extractor_implementation
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<
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BOOST_DEDUCED_TYPENAME member_with_tag<Tag,Relation>::type,
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Relation
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> type;
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};
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template< class Relation >
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struct both_keys_extractor
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{
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typedef BOOST_DEDUCED_TYPENAME Relation::storage_base result_type;
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const result_type & operator()(const Relation & rel) const
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{
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return rel;
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}
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result_type & operator()( Relation & rel) const
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{
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return rel;
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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_DOXYGEN_WILL_NOT_PROCESS_THE_FOLLOWING_LINES
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#endif // BOOST_BIMAP_RELATION_SUPPORT_DATA_EXTRACTOR_HPP
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