| // 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 |
| |