// 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/member_at.hpp | |
/// \brief Defines the tags for the member_at::side idiom | |
#ifndef BOOST_BIMAP_RELATION_MEMBER_AT_HPP | |
#define BOOST_BIMAP_RELATION_MEMBER_AT_HPP | |
#if defined(_MSC_VER) && (_MSC_VER>=1200) | |
#pragma once | |
#endif | |
#include <boost/config.hpp> | |
namespace boost { | |
namespace bimaps { | |
namespace relation { | |
/// \brief member_at::side idiom to access relation values and types using metaprogramming. | |
/** | |
This tags are used to specify which member you want to acces when using a metafunction over | |
a symmetrical type. The idea is to be able to write code like: | |
\code | |
result_of::get<member_at::left,relation>::type data = get<member_at::left>(rel); | |
\endcode | |
The relation class supports this idiom even when the elements are tagged. This is useful | |
because a user can decide to start tagging in any moment of the development. | |
See also member_with_tag, is_tag_of_member_at_left, is_tag_of_member_at_right, get | |
value_type_of, pair_by, pair_type_by. | |
\ingroup relation_group | |
**/ | |
namespace member_at { | |
/// \brief Member at left tag | |
/** | |
See also member_at, rigth. | |
**/ | |
struct left {}; | |
/// \brief Member at right tag | |
/** | |
See also member_at, left. | |
**/ | |
struct right {}; | |
/// \brief Member info tag | |
/** | |
See also member_at, left, right. | |
**/ | |
struct info {}; | |
} | |
} // namespace relation | |
} // namespace bimaps | |
} // namespace boost | |
#endif // BOOST_BIMAP_RELATION_MEMBER_AT_HPP |