mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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173 lines
6.4 KiB
C++
173 lines
6.4 KiB
C++
#ifndef SPROUT_ALGORITHM_FIND_END_HPP
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#define SPROUT_ALGORITHM_FIND_END_HPP
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#include <iterator>
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#include <type_traits>
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#include <sprout/config.hpp>
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#include <sprout/iterator/operation.hpp>
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#include <sprout/iterator/type_traits/is_iterator.hpp>
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#include <sprout/functional/equal_to.hpp>
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#include <sprout/utility/pair.hpp>
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#include <sprout/detail/algorithm/search_one.hpp>
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namespace sprout {
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namespace detail {
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template<typename RandomAccessIterator1>
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inline SPROUT_CONSTEXPR RandomAccessIterator1
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find_end_impl_check_ra(RandomAccessIterator1 first1, RandomAccessIterator1 result, RandomAccessIterator1 searched) {
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return searched == first1 ? searched
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: result
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;
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}
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template<typename RandomAccessIterator1, typename ForwardIterator2, typename BinaryPredicate>
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inline SPROUT_CONSTEXPR RandomAccessIterator1
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find_end_impl_ra(
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RandomAccessIterator1 first1, RandomAccessIterator1 last1,
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ForwardIterator2 first2, ForwardIterator2 last2,
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BinaryPredicate pred,
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typename std::iterator_traits<RandomAccessIterator1>::difference_type pivot, RandomAccessIterator1 last1_, RandomAccessIterator1 result,
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RandomAccessIterator1 searched
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)
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{
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return searched == last1_ ? result
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: searched < first1 ? pivot == 0
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? sprout::detail::find_end_impl_check_ra(
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first1, searched,
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sprout::detail::search_one(first1, last1_, first2, last2, pred)
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)
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: sprout::detail::find_end_impl_ra(
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sprout::next(first1, pivot), last1, first2, last2, pred,
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(sprout::distance(first1, last1) - pivot) / 2, last1_, searched,
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sprout::detail::find_end_impl_ra(
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first1, sprout::next(first1, pivot), first2, last2, pred,
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pivot / 2, last1_, searched,
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first1
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)
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)
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: pivot == 0 ? sprout::detail::search_one(first1, last1_, first2, last2, pred)
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: sprout::detail::find_end_impl_ra(
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sprout::next(first1, pivot), last1, first2, last2, pred,
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(sprout::distance(first1, last1) - pivot) / 2, last1_, result,
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sprout::detail::find_end_impl_ra(
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first1, sprout::next(first1, pivot), first2, last2, pred,
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pivot / 2, last1_, result,
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first1
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)
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)
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;
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}
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template<typename RandomAccessIterator1, typename ForwardIterator2, typename BinaryPredicate>
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inline SPROUT_CONSTEXPR typename std::enable_if<
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sprout::is_constant_distance_iterator<RandomAccessIterator1>::value,
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RandomAccessIterator1
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>::type
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find_end(
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RandomAccessIterator1 first1, RandomAccessIterator1 last1,
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ForwardIterator2 first2, ForwardIterator2 last2,
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BinaryPredicate pred,
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std::random_access_iterator_tag*
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)
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{
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return first1 == last1 ? last1
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: sprout::detail::find_end_impl_ra(
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first1, last1, first2, last2, pred,
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sprout::distance(first1, last1) / 2, last1, last1,
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first1
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)
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;
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}
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template<typename ForwardIterator1>
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inline SPROUT_CONSTEXPR sprout::pair<ForwardIterator1, ForwardIterator1>
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find_end_impl_check(sprout::pair<ForwardIterator1, ForwardIterator1> const& current, ForwardIterator1 last1, ForwardIterator1 searched) {
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typedef sprout::pair<ForwardIterator1, ForwardIterator1> type;
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return searched == current.first ? type(sprout::next(current.first), searched)
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: searched == last1 ? type(last1, current.second)
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: type(sprout::next(current.first), current.second)
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;
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}
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template<typename ForwardIterator1, typename ForwardIterator2, typename BinaryPredicate>
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inline SPROUT_CONSTEXPR sprout::pair<ForwardIterator1, ForwardIterator1>
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find_end_impl_1(
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sprout::pair<ForwardIterator1, ForwardIterator1> const& current,
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ForwardIterator1 last1, ForwardIterator2 first2, ForwardIterator2 last2, BinaryPredicate pred,
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typename std::iterator_traits<ForwardIterator1>::difference_type n
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)
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{
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typedef sprout::pair<ForwardIterator1, ForwardIterator1> type;
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return current.first == last1 ? current
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: n == 1 ? sprout::detail::find_end_impl_check(
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current, last1,
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sprout::detail::search_one(current.first, last1, first2, last2, pred)
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)
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: sprout::detail::find_end_impl_1(
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sprout::detail::find_end_impl_1(
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current,
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last1, first2, last2, pred, n / 2
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),
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last1, first2, last2, pred, n - n / 2
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)
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;
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}
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template<typename ForwardIterator1, typename ForwardIterator2, typename BinaryPredicate>
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inline SPROUT_CONSTEXPR sprout::pair<ForwardIterator1, ForwardIterator1>
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find_end_impl(
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sprout::pair<ForwardIterator1, ForwardIterator1> const& current,
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ForwardIterator1 last1, ForwardIterator2 first2, ForwardIterator2 last2, BinaryPredicate pred,
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typename std::iterator_traits<ForwardIterator1>::difference_type n
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)
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{
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typedef sprout::pair<ForwardIterator1, ForwardIterator1> type;
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return current.first == last1 ? current
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: sprout::detail::find_end_impl(
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sprout::detail::find_end_impl_1(
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current,
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last1, first2, last2, pred, n
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),
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last1, first2, last2, pred, n * 2
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)
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;
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}
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template<typename ForwardIterator1, typename ForwardIterator2, typename BinaryPredicate>
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inline SPROUT_CONSTEXPR ForwardIterator1
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find_end(
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ForwardIterator1 first1, ForwardIterator1 last1,
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ForwardIterator2 first2, ForwardIterator2 last2,
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BinaryPredicate pred,
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void*
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)
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{
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typedef sprout::pair<ForwardIterator1, ForwardIterator1> type;
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return sprout::detail::find_end_impl(type(first1, last1), last1, first2, last2, pred, 1).second;
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}
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} // namespace detail
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// 25.2.6 Find end
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//
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// recursion depth:
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// O(log(N1+N2))
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//
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template<typename ForwardIterator1, typename ForwardIterator2, typename BinaryPredicate>
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inline SPROUT_CONSTEXPR ForwardIterator1
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find_end(
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ForwardIterator1 first1, ForwardIterator1 last1,
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ForwardIterator2 first2, ForwardIterator2 last2,
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BinaryPredicate pred
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)
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{
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typedef typename std::iterator_traits<ForwardIterator1>::iterator_category* category;
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return sprout::detail::find_end(first1, last1, first2, last2, pred, category());
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}
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template<typename ForwardIterator1, typename ForwardIterator2>
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inline SPROUT_CONSTEXPR ForwardIterator1
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find_end(
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ForwardIterator1 first1, ForwardIterator1 last1,
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ForwardIterator2 first2, ForwardIterator2 last2
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)
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{
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return sprout::find_end(first1, last1, first2, last2, sprout::equal_to<>());
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}
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} // namespace sprout
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#endif // #ifndef SPROUT_ALGORITHM_FIND_END_HPP
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