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