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// Boost.Bimap
//
// Copyright (c) 2006-2007 Matias Capeletto
//
// 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)
/// \file relation/support/data_extractor.hpp
/// \brief Data extraction functor.
#ifndef BOOST_BIMAP_RELATION_SUPPORT_DATA_EXTRACTOR_HPP
#define BOOST_BIMAP_RELATION_SUPPORT_DATA_EXTRACTOR_HPP
#if defined(_MSC_VER)
#pragma once
#endif
#include <boost/config.hpp>
#include <boost/bimap/relation/detail/metadata_access_builder.hpp>
#include <functional>
/** \struct boost::bimaps::relation::support::data_extractor
\brief Data extraction functor.
\ingroup relation_group
**/
#ifndef BOOST_BIMAP_DOXYGEN_WILL_NOT_PROCESS_THE_FOLLOWING_LINES
namespace boost {
namespace bimaps {
namespace relation {
namespace support {
template< class Tag, class Relation >
struct data_extractor_implementation;
template< class Relation >
struct data_extractor_implementation< member_at::left, Relation > :
public std::unary_function<Relation,BOOST_DEDUCED_TYPENAME Relation::left_value_type>
{
BOOST_DEDUCED_TYPENAME Relation::left_value_type const &
operator()(Relation const & rel) const
{
return rel.left;
}
BOOST_DEDUCED_TYPENAME Relation::left_value_type &
operator()(Relation & rel) const
{
return rel.left;
}
};
template< class Relation >
struct data_extractor_implementation< member_at::right, Relation > :
public std::unary_function<Relation,BOOST_DEDUCED_TYPENAME Relation::right_value_type>
{
BOOST_DEDUCED_TYPENAME Relation::right_value_type const &
operator()(Relation const & rel) const
{
return rel.right;
}
BOOST_DEDUCED_TYPENAME Relation::right_value_type &
operator()(Relation & rel) const
{
return rel.right;
}
};
template< class Tag, class Relation >
struct data_extractor
{
typedef data_extractor_implementation
<
BOOST_DEDUCED_TYPENAME member_with_tag<Tag,Relation>::type,
Relation
> type;
};
template< class Relation >
struct both_keys_extractor
{
typedef BOOST_DEDUCED_TYPENAME Relation::storage_base result_type;
const result_type & operator()(const Relation & rel) const
{
return rel;
}
result_type & operator()( Relation & rel) const
{
return rel;
}
};
} // namespace support
} // namespace relation
} // namespace bimaps
} // namespace boost
#endif // BOOST_BIMAP_DOXYGEN_WILL_NOT_PROCESS_THE_FOLLOWING_LINES
#endif // BOOST_BIMAP_RELATION_SUPPORT_DATA_EXTRACTOR_HPP
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