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_SLICED_HPP
Chris@16: #define BOOST_RANGE_ADAPTOR_SLICED_HPP
Chris@16: 
Chris@16: #include <boost/range/adaptor/argument_fwd.hpp>
Chris@16: #include <boost/range/size_type.hpp>
Chris@16: #include <boost/range/iterator_range.hpp>
Chris@101: #include <boost/range/concepts.hpp>
Chris@16: 
Chris@16: namespace boost
Chris@16: {
Chris@16:     namespace adaptors
Chris@16:     {
Chris@16:         struct sliced
Chris@16:         {
Chris@16:             sliced(std::size_t t_, std::size_t u_)
Chris@16:                 : t(t_), u(u_) {}
Chris@16:             std::size_t t;
Chris@16:             std::size_t u;
Chris@16:         };
Chris@16: 
Chris@16:         template< class RandomAccessRange >
Chris@16:         class sliced_range : public boost::iterator_range< BOOST_DEDUCED_TYPENAME range_iterator<RandomAccessRange>::type >
Chris@16:         {
Chris@16:             typedef boost::iterator_range< BOOST_DEDUCED_TYPENAME range_iterator<RandomAccessRange>::type > base_t;
Chris@16:         public:
Chris@16:             template<typename Rng, typename T, typename U>
Chris@16:             sliced_range(Rng& rng, T t, U u)
Chris@101:                 : base_t(boost::next(boost::begin(rng), t),
Chris@101:                          boost::next(boost::begin(rng), u))
Chris@16:             {
Chris@16:             }
Chris@16:         };
Chris@16: 
Chris@16:         template< class RandomAccessRange >
Chris@16:         inline sliced_range<RandomAccessRange>
Chris@16:         slice( RandomAccessRange& rng, std::size_t t, std::size_t u )
Chris@16:         {
Chris@101:             BOOST_RANGE_CONCEPT_ASSERT((
Chris@101:                 RandomAccessRangeConcept<RandomAccessRange>));
Chris@101: 
Chris@16:             BOOST_ASSERT( t <= u && "error in slice indices" );
Chris@16:             BOOST_ASSERT( static_cast<std::size_t>(boost::size(rng)) >= u &&
Chris@16:                           "second slice index out of bounds" );
Chris@16: 
Chris@16:             return sliced_range<RandomAccessRange>(rng, t, u);
Chris@16:         }
Chris@16: 
Chris@16:         template< class RandomAccessRange >
Chris@16:         inline iterator_range< BOOST_DEDUCED_TYPENAME range_iterator<const RandomAccessRange>::type >
Chris@16:         slice( const RandomAccessRange& rng, std::size_t t, std::size_t u )
Chris@16:         {
Chris@101:             BOOST_RANGE_CONCEPT_ASSERT((
Chris@101:                 RandomAccessRangeConcept<const RandomAccessRange>));
Chris@101: 
Chris@16:             BOOST_ASSERT( t <= u && "error in slice indices" );
Chris@16:             BOOST_ASSERT( static_cast<std::size_t>(boost::size(rng)) >= u &&
Chris@16:                           "second slice index out of bounds" );
Chris@16: 
Chris@16:             return sliced_range<const RandomAccessRange>(rng, t, u);
Chris@16:         }
Chris@16: 
Chris@16:         template< class RandomAccessRange >
Chris@16:         inline sliced_range<RandomAccessRange>
Chris@16:         operator|( RandomAccessRange& r, const sliced& f )
Chris@16:         {
Chris@101:             BOOST_RANGE_CONCEPT_ASSERT((
Chris@101:                 RandomAccessRangeConcept<RandomAccessRange>));
Chris@101: 
Chris@16:             return sliced_range<RandomAccessRange>( r, f.t, f.u );
Chris@16:         }
Chris@16: 
Chris@16:         template< class RandomAccessRange >
Chris@16:         inline sliced_range<const RandomAccessRange>
Chris@16:         operator|( const RandomAccessRange& r, const sliced& f )
Chris@16:         {
Chris@101:             BOOST_RANGE_CONCEPT_ASSERT((
Chris@101:                 RandomAccessRangeConcept<const RandomAccessRange>));
Chris@101: 
Chris@16:             return sliced_range<const RandomAccessRange>( r, f.t, f.u );
Chris@16:         }
Chris@16: 
Chris@16:     } // namespace adaptors
Chris@16:     using adaptors::sliced_range;
Chris@16: } // namespace boost
Chris@16: 
Chris@16: #endif