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reduce includes' complexity on some inputs

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cf. http://melpon.org/wandbox/permlink/mVNO3IDW8aawsRtD
This commit is contained in:
Mitsuru Kariya 2015-03-29 18:12:52 +09:00
parent b51e338b68
commit 9b5a965efd
1 changed files with 28 additions and 17 deletions
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45
sprout/algorithm/includes.hpp
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@ -19,24 +19,29 @@
namespace sprout { namespace sprout {
namespace detail { namespace detail {
template<typename RandomAccessIterator1, typename InputIterator2, typename Compare> template<typename RandomAccessIterator1, typename InputIterator2, typename Compare>
inline SPROUT_CONSTEXPR InputIterator2 inline SPROUT_CONSTEXPR sprout::pair<InputIterator2, bool>
includes_impl_ra( includes_impl_ra(
RandomAccessIterator1 first1, RandomAccessIterator1 last1, InputIterator2 first2, InputIterator2 last2, Compare comp, RandomAccessIterator1 first1,
typename std::iterator_traits<RandomAccessIterator1>::difference_type pivot sprout::pair<InputIterator2, bool> current,
InputIterator2 last2, Compare comp,
typename std::iterator_traits<RandomAccessIterator1>::difference_type len
) )
{ {
return first2 == last2 ? first2 typedef sprout::pair<InputIterator2, bool> type;
: pivot == 0 ? (!comp(*first1, *first2) && !comp(*first2, *first1) ? sprout::next(first2) : first2) return current.second || current.first == last2 ? current
: len == 1 ? comp(*current.first, *first1)
? type(current.first, true)
: type(comp(*first1, *current.first) ? current.first : sprout::next(current.first), false)
: sprout::detail::includes_impl_ra( : sprout::detail::includes_impl_ra(
sprout::next(first1, pivot), last1, sprout::next(first1, len / 2),
sprout::detail::includes_impl_ra( sprout::detail::includes_impl_ra(
first1, sprout::next(first1, pivot), first1,
first2, current,
last2, comp, last2, comp,
pivot / 2 len / 2
), ),
last2, comp, last2, comp,
(sprout::distance(first1, last1) - pivot) / 2 len - len / 2
) )
; ;
} }
@ -52,9 +57,11 @@ namespace sprout {
{ {
return first1 == last1 ? first2 == last2 return first1 == last1 ? first2 == last2
: sprout::detail::includes_impl_ra( : sprout::detail::includes_impl_ra(
first1, last1, first2, last2, comp, first1,
sprout::distance(first1, last1) / 2 sprout::pair<InputIterator2, bool>(first2, false),
) last2, comp,
sprout::distance(first1, last1)
).first
== last2 == last2
; ;
} }
@ -69,15 +76,19 @@ namespace sprout {
{ {
typedef sprout::pair<InputIterator1, InputIterator2> type; typedef sprout::pair<InputIterator1, InputIterator2> type;
return current.second == last2 || current.first == last1 ? current return current.second == last2 || current.first == last1 ? current
: n == 1 ? !comp(*current.first, *current.second) && !comp(*current.second, *current.first) : n == 1
? type(sprout::next(current.first), sprout::next(current.second)) ? comp(*current.second, *current.first)
: type(sprout::next(current.first), current.second) ? type(last1, current.second)
: type(
sprout::next(current.first),
comp(*current.first, *current.second) ? current.second : sprout::next(current.second)
)
: sprout::detail::includes_impl_1( : sprout::detail::includes_impl_1(
sprout::detail::includes_impl_1( sprout::detail::includes_impl_1(
current, current,
last1, last2, comp, n / 2 last1, last2, comp, n / 2
), ),
last1, last2, comp, n - n / 2 last1, last2, comp, n / 2
) )
; ;
} }