Chris@16: // Boost.Range library
Chris@16: //
Chris@16: //  Copyright Thorsten Ottosen, Neil Groves 2006 - 2008. Use, modification and
Chris@16: //  distribution is subject to the Boost Software License, Version
Chris@16: //  1.0. (See accompanying file LICENSE_1_0.txt or copy at
Chris@16: //  http://www.boost.org/LICENSE_1_0.txt)
Chris@16: //
Chris@16: // For more information, see http://www.boost.org/libs/range/
Chris@16: //
Chris@16: 
Chris@16: #ifndef BOOST_RANGE_ADAPTOR_REVERSED_HPP
Chris@16: #define BOOST_RANGE_ADAPTOR_REVERSED_HPP
Chris@16: 
Chris@16: #include <boost/range/iterator_range.hpp>
Chris@101: #include <boost/range/concepts.hpp>
Chris@16: #include <boost/iterator/reverse_iterator.hpp>
Chris@16: 
Chris@16: namespace boost
Chris@16: {
Chris@16:     namespace range_detail
Chris@16:     {
Chris@16:         template< class R >
Chris@16:         struct reversed_range : 
Chris@16:             public boost::iterator_range< 
Chris@16:                       boost::reverse_iterator<
Chris@16:                         BOOST_DEDUCED_TYPENAME range_iterator<R>::type 
Chris@16:                                               >
Chris@16:                                          >
Chris@16:         {
Chris@16:         private:
Chris@16:             typedef boost::iterator_range< 
Chris@16:                       boost::reverse_iterator<
Chris@16:                         BOOST_DEDUCED_TYPENAME range_iterator<R>::type 
Chris@16:                                               >
Chris@16:                                          >
Chris@16:                 base;
Chris@16:             
Chris@16:         public:
Chris@16:             typedef boost::reverse_iterator<BOOST_DEDUCED_TYPENAME range_iterator<R>::type> iterator;
Chris@16: 
Chris@16:             explicit reversed_range( R& r ) 
Chris@16:                 : base( iterator(boost::end(r)), iterator(boost::begin(r)) )
Chris@16:             { }
Chris@16:         };
Chris@16: 
Chris@16:         struct reverse_forwarder {};
Chris@16:         
Chris@101:         template< class BidirectionalRange >
Chris@101:         inline reversed_range<BidirectionalRange> 
Chris@101:         operator|( BidirectionalRange& r, reverse_forwarder )
Chris@16:         {
Chris@101:             BOOST_RANGE_CONCEPT_ASSERT((
Chris@101:                 BidirectionalRangeConcept<BidirectionalRange>));
Chris@101: 
Chris@101:             return reversed_range<BidirectionalRange>( r );
Chris@16:         }
Chris@101: 
Chris@101:         template< class BidirectionalRange >
Chris@101:         inline reversed_range<const BidirectionalRange> 
Chris@101:         operator|( const BidirectionalRange& r, reverse_forwarder )
Chris@16:         {
Chris@101:             BOOST_RANGE_CONCEPT_ASSERT((
Chris@101:                 BidirectionalRangeConcept<const BidirectionalRange>));
Chris@101: 
Chris@101:             return reversed_range<const BidirectionalRange>( r ); 
Chris@16:         }
Chris@16:         
Chris@16:     } // 'range_detail'
Chris@16:     
Chris@16:     using range_detail::reversed_range;
Chris@16: 
Chris@16:     namespace adaptors
Chris@16:     { 
Chris@16:         namespace
Chris@16:         {
Chris@16:             const range_detail::reverse_forwarder reversed = 
Chris@16:                                             range_detail::reverse_forwarder();
Chris@16:         }
Chris@16:         
Chris@16:         template<class BidirectionalRange>
Chris@16:         inline reversed_range<BidirectionalRange>
Chris@16:         reverse(BidirectionalRange& rng)
Chris@16:         {
Chris@101:             BOOST_RANGE_CONCEPT_ASSERT((
Chris@101:                 BidirectionalRangeConcept<BidirectionalRange>));
Chris@101: 
Chris@16:             return reversed_range<BidirectionalRange>(rng);
Chris@16:         }
Chris@16:         
Chris@16:         template<class BidirectionalRange>
Chris@16:         inline reversed_range<const BidirectionalRange>
Chris@16:         reverse(const BidirectionalRange& rng)
Chris@16:         {
Chris@101:             BOOST_RANGE_CONCEPT_ASSERT((
Chris@101:                 BidirectionalRangeConcept<const BidirectionalRange>));
Chris@101: 
Chris@16:             return reversed_range<const BidirectionalRange>(rng);
Chris@16:         }
Chris@16:     } // 'adaptors'
Chris@16:     
Chris@16: } // 'boost'
Chris@16: 
Chris@16: #endif