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Merge pull request #43 from timblechmann/topic/unary-irange

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irange: introduce one-parameter variant of irange
This commit is contained in:
neilgroves
2017-11-15 19:48:19 +00:00
committed by GitHub
parent 8b98b696ff bb43887430
commit 3771624560
3 changed files with 59 additions and 11 deletions
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include/boost/range/irange.hpp
+9 -2
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@@ -217,7 +217,7 @@ namespace boost
{
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 sz = static_cast<std::ptrdiff_t>(step_size >= 0 ? step_size : -step_size);
@@ -225,12 +225,19 @@ namespace boost
const Integer f = step_size >= 0 ? first : last;
const std::ptrdiff_t num_steps = (l - f) / sz + ((l - f) % sz ? 1 : 0);
BOOST_ASSERT(num_steps >= 0);
return strided_integer_range<Integer>(
iterator_t(first, 0, step_size),
iterator_t(first, num_steps, step_size));
}
template<typename Integer>
integer_range<Integer>
irange(Integer last)
{
return integer_range<Integer>(static_cast<Integer>(0), last);
}
} // namespace boost
#endif // include guard