// 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) && (_MSC_VER>=1200) | |
#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 | |