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