mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
synced 2024-11-14 10:39:05 +00:00
27 lines
677 B
C++
27 lines
677 B
C++
#ifndef SPROUT_DETAIL_COUNT_N_HPP
|
|
#define SPROUT_DETAIL_COUNT_N_HPP
|
|
|
|
#include <iterator>
|
|
#include <sprout/config.hpp>
|
|
#include <sprout/iterator/operation.hpp>
|
|
|
|
namespace sprout {
|
|
namespace detail {
|
|
//
|
|
// count_n
|
|
//
|
|
template<typename InputIterator, typename Size, typename T>
|
|
SPROUT_CONSTEXPR typename std::iterator_traits<InputIterator>::difference_type count_n(
|
|
InputIterator first,
|
|
Size n,
|
|
T const& value
|
|
)
|
|
{
|
|
return n == 0 ? 0
|
|
: (*first == value ? 1 : 0) + sprout::detail::count_n(sprout::next(first), n - 1, value)
|
|
;
|
|
}
|
|
} // namespace detail
|
|
} // namespace sprout
|
|
|
|
#endif // #ifndef SPROUT_DETAIL_COUNT_N_HPP
|