boost/bimap/relation/pair_layout.hpp

   1 // Boost.Bimap
   2 //
   3 // Copyright (c) 2006-2007 Matias Capeletto
   4 //
   5 // Distributed under the Boost Software License, Version 1.0.
   6 // (See accompanying file LICENSE_1_0.txt or copy at
   7 // http://www.boost.org/LICENSE_1_0.txt)
   8
   9 /// \file relation/pair_layout.hpp
  10 /// \brief Tags for pair layouts
  11
  12 #ifndef BOOST_BIMAP_RELATION_PAIR_LAYOUT_HPP
  13 #define BOOST_BIMAP_RELATION_PAIR_LAYOUT_HPP
  14
  15 #if defined(_MSC_VER) && (_MSC_VER>=1200)
  16 #pragma once
  17 #endif
  18
  19 #include <boost/config.hpp>
  20
  21 namespace boost {
  22 namespace bimaps {
  23 namespace relation {
  24
  25 //@{
  26
  27 /// \brief Tag for normal layout. ( A,B -> A,B )
  28
  29 struct normal_layout {};
  30
  31 /// \brief Tag for mirror layout. ( A,B -> B,A )
  32
  33 struct mirror_layout {};
  34
  35 //@}
  36
  37 /** \struct boost::bimaps::relation::inverse_layout
  38 \brief Metafunction to obtain the inverse of a layout.
  39
  40 \code
  41 template< class Layout >
  42 struct inverse_layout
  43 {
  44     typedef {InverseLayout} type;
  45 };
  46 \endcode
  47
  48 See also normal_layout, mirror_layout.
  49                                                                     **/
  50
  51 #ifndef BOOST_BIMAP_DOXYGEN_WILL_NOT_PROCESS_THE_FOLLOWING_LINES
  52
  53 template< class Layout >
  54 struct inverse_layout
  55 {
  56     typedef normal_layout type;
  57 };
  58
  59 template<>
  60 struct inverse_layout< normal_layout >
  61 {
  62     typedef mirror_layout type;
  63 };
  64
  65 #endif // BOOST_BIMAP_DOXYGEN_WILL_NOT_PROCESS_THE_FOLLOWING_LINES
  66
  67 } // namespace relation
  68 } // namespace bimaps
  69 } // namespace boost
  70
  71 #endif // BOOST_BIMAP_RELATION_DETAIL_PAIR_LAYOUT_HPP
  72