83 lines
2.8 KiB
C++
83 lines
2.8 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_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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