mirror of
https://github.com/bolero-MURAKAMI/Sprout
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95 lines
4 KiB
C++
95 lines
4 KiB
C++
#ifndef SPROUT_DETAIL_ALGORITHM_SET_OVERLAP_COUNT_HPP
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#define SPROUT_DETAIL_ALGORITHM_SET_OVERLAP_COUNT_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/iterator/type_traits/category.hpp>
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#include <sprout/iterator/type_traits/common.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/functional/less.hpp>
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namespace sprout {
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namespace detail {
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template<typename InputIterator1, typename InputIterator2, typename Compare>
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inline SPROUT_CONSTEXPR sprout::tuples::tuple<InputIterator1, InputIterator2, typename std::iterator_traits<InputIterator1>::difference_type>
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set_overlap_count_impl_1(
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sprout::tuples::tuple<InputIterator1, InputIterator2, typename std::iterator_traits<InputIterator1>::difference_type> const& current,
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InputIterator1 last1, InputIterator2 last2, Compare comp, typename std::iterator_traits<InputIterator1>::difference_type n
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)
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{
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typedef sprout::tuples::tuple<InputIterator1, InputIterator2, typename std::iterator_traits<InputIterator1>::difference_type> type;
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return sprout::tuples::get<0>(current) == last1 || sprout::tuples::get<1>(current) == last2 ? current
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: n == 1 ? comp(*sprout::tuples::get<0>(current), *sprout::tuples::get<1>(current)) ? type(
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sprout::next(sprout::tuples::get<0>(current)), sprout::tuples::get<1>(current),
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sprout::tuples::get<2>(current)
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)
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: comp(*sprout::tuples::get<1>(current), *sprout::tuples::get<0>(current)) ? type(
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sprout::tuples::get<0>(current), sprout::next(sprout::tuples::get<1>(current)),
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sprout::tuples::get<2>(current)
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)
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: type(
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sprout::next(sprout::tuples::get<0>(current)), sprout::next(sprout::tuples::get<1>(current)),
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sprout::tuples::get<2>(current) + 1
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)
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: sprout::detail::set_overlap_count_impl_1(
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sprout::detail::set_overlap_count_impl_1(
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current,
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last1, last2, comp, n / 2
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),
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last1, last2, comp, n - n / 2
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)
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;
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}
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template<typename InputIterator1, typename InputIterator2, typename Compare>
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inline SPROUT_CONSTEXPR sprout::tuples::tuple<InputIterator1, InputIterator2, typename std::iterator_traits<InputIterator1>::difference_type>
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set_overlap_count_impl(
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sprout::tuples::tuple<InputIterator1, InputIterator2, typename std::iterator_traits<InputIterator1>::difference_type> const& current,
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InputIterator1 last1, InputIterator2 last2, Compare comp, typename std::iterator_traits<InputIterator1>::difference_type n
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)
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{
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return sprout::tuples::get<0>(current) == last1 || sprout::tuples::get<1>(current) == last2 ? current
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: sprout::detail::set_overlap_count_impl(
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sprout::detail::set_overlap_count_impl_1(
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current,
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last1, last2, comp, n
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),
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last1, last2, comp, n * 2
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)
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;
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}
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//
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// set_overlap_count
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//
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// recursion depth:
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// O(log N)
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//
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template<typename InputIterator1, typename InputIterator2, typename Compare>
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inline SPROUT_CONSTEXPR typename std::iterator_traits<InputIterator1>::difference_type
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set_overlap_count(
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InputIterator1 first1, InputIterator1 last1,
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InputIterator2 first2, InputIterator2 last2,
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Compare comp
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)
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{
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typedef sprout::tuples::tuple<InputIterator1, InputIterator2, typename std::iterator_traits<InputIterator1>::difference_type> type;
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return sprout::tuples::get<2>(
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sprout::detail::set_overlap_count_impl(type(first1, first2, 0), last1, last2, comp, 1)
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);
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}
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template<typename InputIterator1, typename InputIterator2>
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inline SPROUT_CONSTEXPR typename std::iterator_traits<InputIterator1>::difference_type
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set_overlap_count(
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InputIterator1 first1, InputIterator1 last1,
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InputIterator2 first2, InputIterator2 last2
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)
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{
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return sprout::detail::set_overlap_count(first1, last1, first2, last2, sprout::less<>());
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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_SET_OVERLAP_COUNT_HPP
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