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https://github.com/bolero-MURAKAMI/Sprout.git
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51 lines
1.8 KiB
C++
51 lines
1.8 KiB
C++
#ifndef SPROUT_DETAIL_ALGORITHM_COUNT_N_IF_HPP
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#define SPROUT_DETAIL_ALGORITHM_COUNT_N_IF_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/algorithm/count_if.hpp>
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namespace sprout {
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namespace detail {
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template<typename InputIterator, typename Size, typename Predicate>
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inline SPROUT_CONSTEXPR typename std::iterator_traits<InputIterator>::difference_type
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count_n_if(
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InputIterator first, Size n, Predicate pred,
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std::random_access_iterator_tag*
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)
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{
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return sprout::count_if(first, sprout::next(first, n), pred);
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}
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template<typename InputIterator, typename Size, typename Predicate>
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inline SPROUT_CONSTEXPR typename std::iterator_traits<InputIterator>::difference_type
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count_n_if_impl(InputIterator first, Size n, Predicate pred) {
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return n == 0 ? 0
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: (pred(*first) ? 1 : 0) + sprout::detail::count_n_if(sprout::next(first), n - 1, pred)
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;
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}
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template<typename InputIterator, typename Size, typename Predicate>
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inline SPROUT_CONSTEXPR typename std::iterator_traits<InputIterator>::difference_type
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count_n_if(
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InputIterator first, Size n, Predicate pred,
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void*
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)
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{
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return sprout::detail::count_n_if_impl(first, n, pred);
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}
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//
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// count_n_if
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//
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template<typename InputIterator, typename Size, typename Predicate>
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inline SPROUT_CONSTEXPR typename std::iterator_traits<InputIterator>::difference_type
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count_n_if(InputIterator first, Size n, Predicate pred) {
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typedef typename std::iterator_traits<InputIterator>::iterator_category* category;
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return sprout::detail::count_n_if(first, n, pred, category());
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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_COUNT_N_IF_HPP
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