boost/bimap/relation/pair_layout.hpp

// 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/pair_layout.hpp
/// \brief Tags for pair layouts
#ifndef BOOST_BIMAP_RELATION_PAIR_LAYOUT_HPP
#define BOOST_BIMAP_RELATION_PAIR_LAYOUT_HPP
#if defined(_MSC_VER)
#pragma once
#endif
#include <boost/config.hpp>
namespace boost {
namespace bimaps {
namespace relation {
//@{
/// \brief Tag for normal layout. ( A,B -> A,B )
struct normal_layout {};
/// \brief Tag for mirror layout. ( A,B -> B,A )
struct mirror_layout {};
//@}
/** \struct boost::bimaps::relation::inverse_layout
\brief Metafunction to obtain the inverse of a layout.
\code
template< class Layout >
struct inverse_layout
{
    typedef {InverseLayout} type;
};
\endcode
See also normal_layout, mirror_layout.
                                                                    **/
#ifndef BOOST_BIMAP_DOXYGEN_WILL_NOT_PROCESS_THE_FOLLOWING_LINES
template< class Layout >
struct inverse_layout
{
    typedef normal_layout type;
};
template<>
struct inverse_layout< normal_layout >
{
    typedef mirror_layout type;
};
#endif // BOOST_BIMAP_DOXYGEN_WILL_NOT_PROCESS_THE_FOLLOWING_LINES
} // namespace relation
} // namespace bimaps
} // namespace boost
#endif // BOOST_BIMAP_RELATION_DETAIL_PAIR_LAYOUT_HPP