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73 lines
1.9 KiB
C++
73 lines
1.9 KiB
C++
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// 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/member_at.hpp
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/// \brief Defines the tags for the member_at::side idiom
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#ifndef BOOST_BIMAP_RELATION_MEMBER_AT_HPP
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#define BOOST_BIMAP_RELATION_MEMBER_AT_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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namespace boost {
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namespace bimaps {
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namespace relation {
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/// \brief member_at::side idiom to access relation values and types using metaprogramming.
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/**
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This tags are used to specify which member you want to acces when using a metafunction over
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a symmetrical type. The idea is to be able to write code like:
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\code
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result_of::get<member_at::left,relation>::type data = get<member_at::left>(rel);
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\endcode
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The relation class supports this idiom even when the elements are tagged. This is useful
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because a user can decide to start tagging in any moment of the development.
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See also member_with_tag, is_tag_of_member_at_left, is_tag_of_member_at_right, get
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value_type_of, pair_by, pair_type_by.
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\ingroup relation_group
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**/
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namespace member_at {
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/// \brief Member at left tag
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/**
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See also member_at, rigth.
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**/
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struct left {};
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/// \brief Member at right tag
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/**
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See also member_at, left.
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**/
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struct right {};
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/// \brief Member info tag
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/**
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See also member_at, left, right.
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**/
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struct info {};
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}
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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_RELATION_MEMBER_AT_HPP
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