mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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252 lines
10 KiB
C++
252 lines
10 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2019 Bolero MURAKAMI
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https://github.com/bolero-MURAKAMI/Sprout
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#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/category.hpp>
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#include <sprout/functional/equal_to.hpp>
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#include <sprout/utility/pair/pair.hpp>
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#include <sprout/detail/algorithm/search_one.hpp>
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#include <sprout/detail/algorithm/search_one_rev.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 last1_, RandomAccessIterator1 searched) {
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return searched == first1 ? searched
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: last1_
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;
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}
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template<typename RandomAccessIterator1, typename RandomAccessIterator2, 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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RandomAccessIterator2 first2, RandomAccessIterator2 last2,
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BinaryPredicate pred,
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typename std::iterator_traits<RandomAccessIterator1>::difference_type pivot, RandomAccessIterator1 last1_,
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RandomAccessIterator1 searched
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)
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{
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return searched != last1_ ? searched
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: pivot == 0
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? sprout::detail::find_end_impl_check_ra(
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first1, last1_,
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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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first1, sprout::next(first1, pivot), first2, last2, pred,
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pivot / 2, last1_,
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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_,
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last1_
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)
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)
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;
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}
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template<typename RandomAccessIterator1, typename RandomAccessIterator2, typename BinaryPredicate>
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inline SPROUT_CONSTEXPR RandomAccessIterator1
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find_end_impl_ra1(
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RandomAccessIterator1 first1, RandomAccessIterator1 last1,
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RandomAccessIterator2 first2, RandomAccessIterator2 last2,
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BinaryPredicate pred,
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typename std::iterator_traits<RandomAccessIterator1>::difference_type len1,
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typename std::iterator_traits<RandomAccessIterator2>::difference_type len2
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)
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{
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return len1 < len2 ? last1
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: sprout::detail::find_end_impl_ra(
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first1, last1 - len2 + 1, first2, last2, pred,
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(len1 - len2 + 1) / 2, last1, last1
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)
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;
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}
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template<typename RandomAccessIterator1, typename RandomAccessIterator2, typename BinaryPredicate>
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inline SPROUT_CONSTEXPR typename std::enable_if<
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sprout::is_constant_distance_iterator<RandomAccessIterator1>::value && sprout::is_constant_distance_iterator<RandomAccessIterator2>::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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RandomAccessIterator2 first2, RandomAccessIterator2 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 sprout::detail::find_end_impl_ra1(
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first1, last1, first2, last2, pred,
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sprout::distance(first1, last1), sprout::distance(first2, last2)
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)
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;
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}
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template<typename BidirectionalIterator1>
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inline SPROUT_CONSTEXPR sprout::pair<BidirectionalIterator1, BidirectionalIterator1>
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find_end_impl_check_bi(
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sprout::pair<BidirectionalIterator1, BidirectionalIterator1> const& current,
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BidirectionalIterator1 first1, sprout::pair<BidirectionalIterator1, bool> searched
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)
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{
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typedef sprout::pair<BidirectionalIterator1, BidirectionalIterator1> type;
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return searched.second ? type(first1, current.second)
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: searched.first == current.first ? type(sprout::prev(current.first), current.second)
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: type(current.first, searched.first)
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;
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}
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template<typename BidirectionalIterator1, typename BidirectionalIterator2, typename BinaryPredicate>
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inline SPROUT_CONSTEXPR sprout::pair<BidirectionalIterator1, BidirectionalIterator1>
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find_end_impl_bi1(
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sprout::pair<BidirectionalIterator1, BidirectionalIterator1> const& current,
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BidirectionalIterator1 first1, BidirectionalIterator1 last1,
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BidirectionalIterator2 first2, BidirectionalIterator2 last2, BinaryPredicate pred,
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typename std::iterator_traits<BidirectionalIterator1>::difference_type n
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)
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{
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return current.second != last1 || current.first == first1 ? current
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: n == 1 ? sprout::detail::find_end_impl_check_bi(
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current, first1,
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sprout::detail::search_one_rev(first1, current.first, first2, last2, pred)
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)
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: sprout::detail::find_end_impl_bi1(
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sprout::detail::find_end_impl_bi1(
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current,
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first1, last1, first2, last2, pred, n / 2
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),
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first1, 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 BidirectionalIterator1, typename BidirectionalIterator2, typename BinaryPredicate>
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inline SPROUT_CONSTEXPR sprout::pair<BidirectionalIterator1, BidirectionalIterator1>
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find_end_impl_bi(
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sprout::pair<BidirectionalIterator1, BidirectionalIterator1> const& current,
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BidirectionalIterator1 first1, BidirectionalIterator1 last1,
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BidirectionalIterator2 first2, BidirectionalIterator2 last2, BinaryPredicate pred,
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typename std::iterator_traits<BidirectionalIterator1>::difference_type n
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)
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{
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return current.second != last1 || current.first == first1 ? current
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: sprout::detail::find_end_impl_bi(
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sprout::detail::find_end_impl_bi1(
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current,
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first1, last1, first2, last2, pred, n
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),
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first1, last1, first2, last2, pred, n * 2
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)
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;
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}
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template<typename BidirectionalIterator1, typename BidirectionalIterator2, typename BinaryPredicate>
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inline SPROUT_CONSTEXPR BidirectionalIterator1
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find_end(
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BidirectionalIterator1 first1, BidirectionalIterator1 last1,
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BidirectionalIterator2 first2, BidirectionalIterator2 last2,
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BinaryPredicate pred,
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std::bidirectional_iterator_tag*
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)
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{
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typedef sprout::pair<BidirectionalIterator1, BidirectionalIterator1> type;
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return sprout::detail::find_end_impl_bi(type(last1, last1), first1, last1, first2, last2, pred, 1).second;
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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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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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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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std::forward_iterator_tag*
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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 sprout::common_iterator_category<ForwardIterator1, ForwardIterator2>::type* category;
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return first1 == last1 || first2 == last2 ? last1 : 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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