mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
synced 2024-11-14 10:39:05 +00:00
51 lines
1.8 KiB
C++
51 lines
1.8 KiB
C++
#ifndef SPROUT_DETAIL_ALGORITHM_COUNT_N_IF_HPP
|
|
#define SPROUT_DETAIL_ALGORITHM_COUNT_N_IF_HPP
|
|
|
|
#include <iterator>
|
|
#include <sprout/config.hpp>
|
|
#include <sprout/iterator/operation.hpp>
|
|
#include <sprout/algorithm/count_if.hpp>
|
|
|
|
namespace sprout {
|
|
namespace detail {
|
|
template<typename InputIterator, typename Size, typename Predicate>
|
|
inline SPROUT_CONSTEXPR typename std::iterator_traits<InputIterator>::difference_type
|
|
count_n_if(
|
|
InputIterator first, Size n, Predicate pred,
|
|
std::random_access_iterator_tag*
|
|
)
|
|
{
|
|
return sprout::count_if(first, sprout::next(first, n), pred);
|
|
}
|
|
|
|
template<typename InputIterator, typename Size, typename Predicate>
|
|
inline SPROUT_CONSTEXPR typename std::iterator_traits<InputIterator>::difference_type
|
|
count_n_if_impl(InputIterator first, Size n, Predicate pred) {
|
|
return n == 0 ? 0
|
|
: (pred(*first) ? 1 : 0) + sprout::detail::count_n_if(sprout::next(first), n - 1, pred)
|
|
;
|
|
}
|
|
template<typename InputIterator, typename Size, typename Predicate>
|
|
inline SPROUT_CONSTEXPR typename std::iterator_traits<InputIterator>::difference_type
|
|
count_n_if(
|
|
InputIterator first, Size n, Predicate pred,
|
|
void*
|
|
)
|
|
{
|
|
return sprout::detail::count_n_if_impl(first, n, pred);
|
|
}
|
|
|
|
//
|
|
// count_n_if
|
|
//
|
|
template<typename InputIterator, typename Size, typename Predicate>
|
|
inline SPROUT_CONSTEXPR typename std::iterator_traits<InputIterator>::difference_type
|
|
count_n_if(InputIterator first, Size n, Predicate pred) {
|
|
typedef typename std::iterator_traits<InputIterator>::iterator_category* category;
|
|
return sprout::detail::count_n_if(first, n, pred, category());
|
|
|
|
}
|
|
} // namespace detail
|
|
} // namespace sprout
|
|
|
|
#endif // #ifndef SPROUT_DETAIL_ALGORITHM_COUNT_N_IF_HPP
|