73 lines
1.9 KiB
C++
73 lines
1.9 KiB
C++
|
// 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)
|
||
|
|
#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
|