text: // 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/support/get_pair_functor.hpp
  /// \brief get_pair_functor definition
  
  #ifndef BOOST_BIMAP_RELATION_SUPPORT_GET_PAIR_FUNCTOR_HPP
  #define BOOST_BIMAP_RELATION_SUPPORT_GET_PAIR_FUNCTOR_HPP
  
  #if defined(_MSC_VER) && (_MSC_VER>=1200)
  #pragma once
  #endif
  
  #include <boost/config.hpp>
  
  #include <boost/bimap/relation/support/pair_by.hpp>
  
  namespace boost {
  namespace bimaps {
  namespace relation {
  namespace support {
  
  /// \brief A Functor that takes a relation as a parameter an return the desired view.
  /**
  
  This functor is included to help users of the relation class when using
  stl algorithms.
  
  See also member_at, pair_by().
  \ingroup relation_group
  
                                                                                    **/
  
  template< class Tag, class Relation >
  struct get_pair_functor
  {
      BOOST_DEDUCED_TYPENAME result_of::pair_by<Tag,Relation>::type
      operator()( Relation & r ) const
      {
          return pair_by<Tag>(r);
      }
  
      BOOST_DEDUCED_TYPENAME result_of::pair_by<Tag,const Relation>::type
      operator()( const Relation & r ) const
      {
          return pair_by<Tag>(r);
      }
  };
  
  
  /// \brief A Functor that takes a relation as a parameter an return the above view.
  /**
  
  \ingroup relation_group
                                                                                    **/
  
  template< class Relation >
  struct get_above_view_functor
  {
      BOOST_DEDUCED_TYPENAME Relation::above_view &
      operator()( Relation & r ) const
      {
          return r.get_view();
      }
  
      const BOOST_DEDUCED_TYPENAME Relation::above_view &
      operator()( const Relation & r ) const
      {
          return r.get_view();
      }
  };
  
  } // namespace support
  } // namespace relation
  } // namespace bimaps
  } // namespace boost
  
  
  #endif // BOOST_BIMAP_RELATION_SUPPORT_GET_PAIR_FUNCTOR_HPP
  
  