ceph/src/boost/libs/bimap/include/boost/bimap/relation/support/get_pair_functor.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/support/get_pair_functor.hpp
  10 /// \brief get_pair_functor definition
  11
  12 #ifndef BOOST_BIMAP_RELATION_SUPPORT_GET_PAIR_FUNCTOR_HPP
  13 #define BOOST_BIMAP_RELATION_SUPPORT_GET_PAIR_FUNCTOR_HPP
  14
  15 #if defined(_MSC_VER)
  16 #pragma once
  17 #endif
  18
  19 #include <boost/config.hpp>
  20
  21 #include <boost/bimap/relation/support/pair_by.hpp>
  22
  23 namespace boost {
  24 namespace bimaps {
  25 namespace relation {
  26 namespace support {
  27
  28 /// \brief A Functor that takes a relation as a parameter an return the desired view.
  29 /**
  30
  31 This functor is included to help users of the relation class when using
  32 stl algorithms.
  33
  34 See also member_at, pair_by().
  35 \ingroup relation_group
  36
  37                                                                                   **/
  38
  39 template< class Tag, class Relation >
  40 struct get_pair_functor
  41 {
  42     BOOST_DEDUCED_TYPENAME result_of::pair_by<Tag,Relation>::type
  43     operator()( Relation & r ) const
  44     {
  45         return pair_by<Tag>(r);
  46     }
  47
  48     BOOST_DEDUCED_TYPENAME result_of::pair_by<Tag,const Relation>::type
  49     operator()( const Relation & r ) const
  50     {
  51         return pair_by<Tag>(r);
  52     }
  53 };
  54
  55
  56 /// \brief A Functor that takes a relation as a parameter an return the above view.
  57 /**
  58
  59 \ingroup relation_group
  60                                                                                   **/
  61
  62 template< class Relation >
  63 struct get_above_view_functor
  64 {
  65     BOOST_DEDUCED_TYPENAME Relation::above_view &
  66     operator()( Relation & r ) const
  67     {
  68         return r.get_view();
  69     }
  70
  71     const BOOST_DEDUCED_TYPENAME Relation::above_view &
  72     operator()( const Relation & r ) const
  73     {
  74         return r.get_view();
  75     }
  76 };
  77
  78 } // namespace support
  79 } // namespace relation
  80 } // namespace bimaps
  81 } // namespace boost
  82
  83
  84 #endif // BOOST_BIMAP_RELATION_SUPPORT_GET_PAIR_FUNCTOR_HPP
  85