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