bimap/relation/pair_layout.hpp

0001 // Boost.Bimap
0002 //
0003 // Copyright (c) 2006-2007 Matias Capeletto
0004 //
0005 // Distributed under the Boost Software License, Version 1.0.
0006 // (See accompanying file LICENSE_1_0.txt or copy at
0007 // http://www.boost.org/LICENSE_1_0.txt)
0008
0009 /// \file relation/pair_layout.hpp
0010 /// \brief Tags for pair layouts
0011
0012 #ifndef BOOST_BIMAP_RELATION_PAIR_LAYOUT_HPP
0013 #define BOOST_BIMAP_RELATION_PAIR_LAYOUT_HPP
0014
0015 #if defined(_MSC_VER)
0016 #pragma once
0017 #endif
0018
0019 #include <boost/config.hpp>
0020
0021 namespace boost {
0022 namespace bimaps {
0023 namespace relation {
0024
0025 //@{
0026
0027 /// \brief Tag for normal layout. ( A,B -> A,B )
0028
0029 struct normal_layout {};
0030
0031 /// \brief Tag for mirror layout. ( A,B -> B,A )
0032
0033 struct mirror_layout {};
0034
0035 //@}
0036
0037 /** \struct boost::bimaps::relation::inverse_layout
0038 \brief Metafunction to obtain the inverse of a layout.
0039
0040 \code
0041 template< class Layout >
0042 struct inverse_layout
0043 {
0044     typedef {InverseLayout} type;
0045 };
0046 \endcode
0047
0048 See also normal_layout, mirror_layout.
0049                                                                     **/
0050
0051 #ifndef BOOST_BIMAP_DOXYGEN_WILL_NOT_PROCESS_THE_FOLLOWING_LINES
0052
0053 template< class Layout >
0054 struct inverse_layout
0055 {
0056     typedef normal_layout type;
0057 };
0058
0059 template<>
0060 struct inverse_layout< normal_layout >
0061 {
0062     typedef mirror_layout type;
0063 };
0064
0065 #endif // BOOST_BIMAP_DOXYGEN_WILL_NOT_PROCESS_THE_FOLLOWING_LINES
0066
0067 } // namespace relation
0068 } // namespace bimaps
0069 } // namespace boost
0070
0071 #endif // BOOST_BIMAP_RELATION_DETAIL_PAIR_LAYOUT_HPP
0072