count

Interface

template<typename InputIterator, typename T>
inline SPROUT_CONSTEXPR typename std::iterator_traits<InputIterator>::difference_type
count(InputIterator first, InputIterator last, T const& value);

Returns

The number of iterators i in the range [first,last) for which the following corresponding conditions hold: *i == value.

Examples

#include <sprout/algorithm/count.hpp>
#include <sprout/array.hpp>
#include <sprout/container.hpp>
using namespace sprout;

SPROUT_STATIC_CONSTEXPR auto input = array<int, 10>{{1, 2, 3, 5, 5, 5, 5, 8, 9, 10}};
SPROUT_STATIC_CONSTEXPR auto result = sprout::count(begin(input), end(input), 5);
static_assert(result == 4, "counted 4 elements equal to 5 from input.");

Complexity

Exactly last - first applications of the predicate.

Recursive function invocations in O(logN) (logarithmic) depth.

Header

sprout/algorithm/count.hpp

Convenience header: sprout/algorithm.hpp