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https://github.com/bolero-MURAKAMI/Sprout.git
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73 lines
2.2 KiB
C++
73 lines
2.2 KiB
C++
#ifndef SPROUT_DETAIL_ALGORITHM_OVERLAP_COUNT_HPP
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#define SPROUT_DETAIL_ALGORITHM_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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namespace sprout {
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namespace detail {
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template<typename InputIterator>
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inline SPROUT_CONSTEXPR typename std::iterator_traits<InputIterator>::difference_type overlap_count_impl(
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InputIterator first,
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InputIterator last,
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typename std::iterator_traits<InputIterator>::value_type const& value,
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typename std::iterator_traits<InputIterator>::difference_type current = 0
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)
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{
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return first == last
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? 0
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: *first == value
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? 1 + sprout::detail::overlap_count_impl(sprout::next(first), last, value)
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: sprout::detail::overlap_count_impl(sprout::next(first), last, *first)
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;
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}
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//
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// overlap_count
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//
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template<typename InputIterator>
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inline SPROUT_CONSTEXPR typename std::iterator_traits<InputIterator>::difference_type overlap_count(
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InputIterator first,
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InputIterator last
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)
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{
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return first == last
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? 0
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: sprout::detail::overlap_count_impl(sprout::next(first), last, *first)
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;
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}
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template<typename InputIterator, typename Predicate>
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inline SPROUT_CONSTEXPR typename std::iterator_traits<InputIterator>::difference_type overlap_count_impl(
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InputIterator first,
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InputIterator last,
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Predicate pred,
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typename std::iterator_traits<InputIterator>::value_type const& value
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)
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{
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return first == last
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? 0
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: pred(*first, value)
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? 1 + sprout::detail::overlap_count_impl(sprout::next(first), last, pred, value)
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: sprout::detail::overlap_count_impl(sprout::next(first), last, pred, *first)
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;
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}
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//
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// overlap_count
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//
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template<typename InputIterator, typename Predicate>
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inline SPROUT_CONSTEXPR typename std::iterator_traits<InputIterator>::difference_type overlap_count(
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InputIterator first,
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InputIterator last,
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Predicate pred
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)
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{
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return first == last
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? 0
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: sprout::detail::overlap_count_impl(sprout::next(first), last, pred, *first)
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;
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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_OVERLAP_COUNT_HPP
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