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