Chris@16: // Boost.Bimap
Chris@16: //
Chris@16: // Copyright (c) 2006-2007 Matias Capeletto
Chris@16: //
Chris@16: // Distributed under the Boost Software License, Version 1.0.
Chris@16: // (See accompanying file LICENSE_1_0.txt or copy at
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: /// \file relation/member_at.hpp
Chris@16: /// \brief Defines the tags for the member_at::side idiom
Chris@16: 
Chris@16: #ifndef BOOST_BIMAP_RELATION_MEMBER_AT_HPP
Chris@16: #define BOOST_BIMAP_RELATION_MEMBER_AT_HPP
Chris@16: 
Chris@101: #if defined(_MSC_VER)
Chris@16: #pragma once
Chris@16: #endif
Chris@16: 
Chris@16: #include <boost/config.hpp>
Chris@16: 
Chris@16: namespace boost {
Chris@16: namespace bimaps {
Chris@16: namespace relation {
Chris@16: 
Chris@16: /// \brief member_at::side idiom to access relation values and types using metaprogramming. 
Chris@16: /**
Chris@16: 
Chris@16: This tags are used to specify which member you want to acces when using a metafunction over
Chris@16: a symmetrical type. The idea is to be able to write code like:
Chris@16: 
Chris@16: \code
Chris@16: result_of::get<member_at::left,relation>::type data = get<member_at::left>(rel);
Chris@16: \endcode
Chris@16: 
Chris@16: The relation class supports this idiom even when the elements are tagged. This is useful
Chris@16: because a user can decide to start tagging in any moment of the development.
Chris@16: 
Chris@16: See also member_with_tag, is_tag_of_member_at_left, is_tag_of_member_at_right, get
Chris@16: value_type_of, pair_by, pair_type_by.
Chris@16: 
Chris@16: \ingroup relation_group
Chris@16:                                                                                         **/
Chris@16: namespace member_at {
Chris@16: 
Chris@16:     /// \brief Member at left tag
Chris@16:     /**
Chris@16:     See also member_at, rigth.
Chris@16:                                             **/
Chris@16: 
Chris@16:     struct left  {};
Chris@16: 
Chris@16:     /// \brief Member at right tag
Chris@16:     /**
Chris@16:     See also member_at, left.
Chris@16:                                             **/
Chris@16: 
Chris@16:     struct right {};
Chris@16: 
Chris@16:     /// \brief Member info tag
Chris@16:     /**
Chris@16:     See also member_at, left, right.
Chris@16:                                             **/
Chris@16: 
Chris@16:     struct info  {};
Chris@16: 
Chris@16: }
Chris@16: 
Chris@16: } // namespace relation
Chris@16: } // namespace bimaps
Chris@16: } // namespace boost
Chris@16: 
Chris@16: #endif // BOOST_BIMAP_RELATION_MEMBER_AT_HPP