boost/range/adaptor/sliced.hpp
// 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>
#include <boost/range/concepts.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::next(boost::begin(rng), t),
boost::next(boost::begin(rng), u))
{
}
};
template< class RandomAccessRange >
inline sliced_range<RandomAccessRange>
slice( RandomAccessRange& rng, std::size_t t, std::size_t u )
{
BOOST_RANGE_CONCEPT_ASSERT((
RandomAccessRangeConcept<RandomAccessRange>));
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_RANGE_CONCEPT_ASSERT((
RandomAccessRangeConcept<const RandomAccessRange>));
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 )
{
BOOST_RANGE_CONCEPT_ASSERT((
RandomAccessRangeConcept<RandomAccessRange>));
return sliced_range<RandomAccessRange>( r, f.t, f.u );
}
template< class RandomAccessRange >
inline sliced_range<const RandomAccessRange>
operator|( const RandomAccessRange& r, const sliced& f )
{
BOOST_RANGE_CONCEPT_ASSERT((
RandomAccessRangeConcept<const RandomAccessRange>));
return sliced_range<const RandomAccessRange>( r, f.t, f.u );
}
} // namespace adaptors
using adaptors::sliced_range;
} // namespace boost
#endif