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109 lines
5 KiB
C++
109 lines
5 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_DETAIL_ALGORITHM_SEARCH_ONE_REV_HPP
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#define SPROUT_DETAIL_ALGORITHM_SEARCH_ONE_REV_HPP
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#include <iterator>
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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/tuple/tuple/tuple.hpp>
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#include <sprout/tuple/tuple/get.hpp>
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#include <sprout/utility/pair/pair.hpp>
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namespace sprout {
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namespace detail {
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template<typename BidirectionalIterator1, typename BidirectionalIterator2, typename BinaryPredicate>
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inline SPROUT_CONSTEXPR sprout::tuples::tuple<BidirectionalIterator1, BidirectionalIterator2, bool>
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search_one_rev_impl_1(
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sprout::tuples::tuple<BidirectionalIterator1, BidirectionalIterator2, bool> const& current,
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BidirectionalIterator1 first1, BidirectionalIterator2 first2, 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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typedef sprout::tuples::tuple<BidirectionalIterator1, BidirectionalIterator2, bool> type;
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return sprout::tuples::get<2>(current) ? current
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: sprout::tuples::get<1>(current) == first2 ? type(sprout::tuples::get<0>(current), first2, true)
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: sprout::tuples::get<0>(current) == first1 ? type(first1, sprout::tuples::get<1>(current), true)
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: n == 1 ? pred(*sprout::prev(sprout::tuples::get<0>(current)), *sprout::prev(sprout::tuples::get<1>(current)))
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? type(sprout::prev(sprout::tuples::get<0>(current)), sprout::prev(sprout::tuples::get<1>(current)), false)
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: type(sprout::tuples::get<0>(current), sprout::tuples::get<1>(current), true)
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: sprout::detail::search_one_rev_impl_1(
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sprout::detail::search_one_rev_impl_1(
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current,
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first1, first2, pred, n / 2
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),
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first1, first2, 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::tuples::tuple<BidirectionalIterator1, BidirectionalIterator2, bool>
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search_one_rev_impl(
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sprout::tuples::tuple<BidirectionalIterator1, BidirectionalIterator2, bool> const& current,
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BidirectionalIterator1 first1, BidirectionalIterator2 first2, 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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typedef sprout::tuples::tuple<BidirectionalIterator1, BidirectionalIterator2, bool> type;
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return sprout::tuples::get<2>(current) ? current
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: sprout::tuples::get<1>(current) == first2 ? type(sprout::tuples::get<0>(current), first2, true)
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: sprout::tuples::get<0>(current) == first1 ? type(first1, sprout::tuples::get<1>(current), true)
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: sprout::detail::search_one_rev_impl(
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sprout::detail::search_one_rev_impl_1(
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current,
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first1, first2, pred, n
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),
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first1, first2, pred, n * 2
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)
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;
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}
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template<typename BidirectionalIterator1, typename BidirectionalIterator2>
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inline SPROUT_CONSTEXPR sprout::pair<BidirectionalIterator1, bool>
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search_one_rev_check(
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sprout::tuples::tuple<BidirectionalIterator1, BidirectionalIterator2, bool> const& result,
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BidirectionalIterator1 first1, BidirectionalIterator1 last1, BidirectionalIterator2 first2
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)
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{
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typedef sprout::pair<BidirectionalIterator1, bool> type;
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return sprout::tuples::get<1>(result) == first2 ? type(sprout::tuples::get<0>(result), false)
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: type(last1, sprout::tuples::get<0>(result) == first1)
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;
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}
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//
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// search_one_rev
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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 BidirectionalIterator1, typename BidirectionalIterator2, typename BinaryPredicate>
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inline SPROUT_CONSTEXPR sprout::pair<BidirectionalIterator1, bool>
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search_one_rev(
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BidirectionalIterator1 first1, BidirectionalIterator1 last1,
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BidirectionalIterator2 first2, BidirectionalIterator2 last2, BinaryPredicate pred
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)
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{
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typedef sprout::tuples::tuple<BidirectionalIterator1, BidirectionalIterator2, bool> type;
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return sprout::detail::search_one_rev_check(
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sprout::detail::search_one_rev_impl(type(last1, last2, false), first1, first2, pred, 1),
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first1, last1, first2);
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}
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template<typename BidirectionalIterator1, typename BidirectionalIterator2>
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inline SPROUT_CONSTEXPR sprout::pair<BidirectionalIterator1, bool>
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search_one_rev(
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BidirectionalIterator1 first1, BidirectionalIterator1 last1,
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BidirectionalIterator2 first2, BidirectionalIterator2 last2
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)
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{
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return sprout::detail::search_one_rev(first1, last1, first2, last2, sprout::equal_to<>());
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}
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} // namespace detail
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} // namespace sprout
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#endif // #ifndef SPROUT_DETAIL_ALGORITHM_SEARCH_ONE_REV_HPP
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