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fix equal for empty range

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This commit is contained in:
Mitsuru Kariya 2013-08-27 02:16:11 +09:00
parent d6592a9ce3
commit 98445c98eb
1 changed files with 7 additions and 22 deletions
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25
sprout/algorithm/equal.hpp
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@ -131,24 +131,6 @@ namespace sprout {
return sprout::tuples::get<2>(current) && sprout::tuples::get<0>(current) == last1 && sprout::tuples::get<1>(current) == last2;
}
template<typename RandomAccessIterator1, typename RandomAccessIterator2, typename BinaryPredicate>
inline SPROUT_CONSTEXPR bool
equal2_impl_ra(
RandomAccessIterator1 first1, RandomAccessIterator1 last1, RandomAccessIterator2 first2, RandomAccessIterator2 last2, BinaryPredicate pred,
typename std::iterator_traits<RandomAccessIterator1>::difference_type pivot
)
{
return pivot == 0 ? pred(*first1, *first2)
: sprout::detail::equal2_impl_ra(
first1, sprout::next(first1, pivot), first2, sprout::next(first2, pivot), pred,
pivot / 2
)
&& sprout::detail::equal2_impl_ra(
sprout::next(first1, pivot), last1, sprout::next(first2, pivot), last2, pred,
(sprout::distance(first1, last1) - pivot) / 2
)
;
}
template<typename RandomAccessIterator1, typename RandomAccessIterator2, typename BinaryPredicate>
inline SPROUT_CONSTEXPR typename std::enable_if<
sprout::is_constant_distance_iterator<RandomAccessIterator1>::value && sprout::is_constant_distance_iterator<RandomAccessIterator2>::value,
@ -160,10 +142,13 @@ namespace sprout {
)
{
return sprout::distance(first1, last1) == sprout::distance(first2, last2)
&& sprout::detail::equal2_impl_ra(
first1, last1, first2, last2, pred,
&& (
sprout::distance(first1, last1) == 0
|| sprout::detail::equal_impl_ra(
first1, last1, first2, pred,
sprout::distance(first1, last1) / 2
)
)
;
}