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https://github.com/bolero-MURAKAMI/Sprout.git
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113 lines
3.8 KiB
C++
113 lines
3.8 KiB
C++
#ifndef SPROUT_ALGORITHM_SEARCH_HPP
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#define SPROUT_ALGORITHM_SEARCH_HPP
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#include <sprout/config.hpp>
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#include <sprout/iterator/operation.hpp>
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#include <sprout/functional/equal_to.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, typename ForwardIterator2, typename BinaryPredicate>
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inline SPROUT_CONSTEXPR RandomAccessIterator1
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search_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 searched
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)
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{
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return searched < first1 || searched == last1_ ? searched
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: pivot == 0 ? sprout::detail::search_one(first1, last1_, first2, last2, pred)
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: sprout::detail::search_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_,
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sprout::detail::search_impl_ra(
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first1, sprout::next(first1, pivot), first2, last2, pred,
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pivot / 2, last1_,
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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 RandomAccessIterator1
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search(
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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::search_impl_ra(
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first1, last1, first2, last2, pred,
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sprout::distance(first1, last1) / 2, last1, first1
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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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search_impl(
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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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ForwardIterator1 searched
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)
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{
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return searched == first1 || searched == last1 ? searched
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: sprout::detail::search_impl(
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sprout::next(first1), last1, first2, last2, pred,
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sprout::detail::search_one(sprout::next(first1), last1, first2, last2, pred)
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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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search(
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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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return sprout::detail::search_impl(
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first1, last1, first2, last2, pred,
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sprout::detail::search_one(first1, last1, first2, last2, pred)
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);
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}
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} //namespace detail
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// 25.2.13 Search
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//
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// recursion depth:
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// [first1, last1) is RandomAccessIterator -> O(log N1)
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// otherwise -> O(N1)
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// [first2, last2) is RandomAccessIterator -> O(log N2)
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// otherwise -> O(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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search(
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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::search(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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search(
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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::search(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_SEARCH_HPP
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