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Boost.Range - modified join and irange to return public range types.

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[SVN r61690]
This commit is contained in:
Neil Groves
2010-04-29 22:03:58 +00:00
parent 3ef3363c2d
commit c9802507ab
3 changed files with 95 additions and 99 deletions
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40
include/boost/range/irange.hpp
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@ -173,28 +173,54 @@ namespace boost
} // namespace range_detail
template<typename Integer>
iterator_range< range_detail::integer_iterator<Integer> >
irange(Integer first, Integer last)
class integer_range
: public iterator_range< range_detail::integer_iterator<Integer> >
{
typedef range_detail::integer_iterator<Integer> iterator_t;
typedef iterator_range<iterator_t> base_t;
public:
integer_range(Integer first, Integer last)
: base_t(iterator_t(first), iterator_t(last))
{
}
};
template<typename Integer>
class strided_integer_range
: public iterator_range< range_detail::integer_iterator_with_step<Integer> >
{
typedef range_detail::integer_iterator_with_step<Integer> iterator_t;
typedef iterator_range<iterator_t> base_t;
public:
template<typename Iterator>
strided_integer_range(Iterator first, Iterator last)
: base_t(first, last)
{
}
};
template<typename Integer>
integer_range<Integer>
irange(Integer first, Integer last)
{
BOOST_ASSERT( first <= last );
return boost::iterator_range< range_detail::integer_iterator<Integer> >(
range_detail::integer_iterator<Integer>(first),
range_detail::integer_iterator<Integer>(last));
return integer_range<Integer>(first, last);
}
template<typename Integer, typename StepSize>
iterator_range< range_detail::integer_iterator_with_step<Integer> >
strided_integer_range<Integer>
irange(Integer first, Integer last, StepSize step_size)
{
BOOST_ASSERT( step_size != 0 );
BOOST_ASSERT( (step_size > 0) ? (last >= first) : (last <= first) );
typedef typename range_detail::integer_iterator_with_step<Integer> iterator_t;
const std::ptrdiff_t last_step
= (static_cast<std::ptrdiff_t>(last) - static_cast<std::ptrdiff_t>(first))
/ (static_cast<std::ptrdiff_t>(step_size));
return boost::iterator_range< iterator_t >(
return strided_integer_range<Integer>(
iterator_t(first, 0, step_size),
iterator_t(first, last_step, step_size));
}