Sprout/sprout/cstring/strlen.hpp

#ifndef SPROUT_CSTRING_STRLEN_HPP
#define SPROUT_CSTRING_STRLEN_HPP

#include <cstddef>
#include <sprout/config.hpp>
#include <sprout/iterator/ptr_index_iterator.hpp>
#include HDR_ALGORITHM_SSCRISK_CEL_OR_SPROUT
#include <sprout/iterator/operation.hpp>

namespace sprout {
	// 7.21.6.3  strlen <20>֐<EFBFBD>
	inline SPROUT_CONSTEXPR std::size_t
	strlen(char const* s) {
		return !*s ? 0
			: 1 + sprout::strlen(s + 1)
			;
	}

	inline SPROUT_CONSTEXPR std::size_t
	strlen(char const* s, std::size_t n) {
		return sprout::distance(
			sprout::as_iterator(s),
			NS_SSCRISK_CEL_OR_SPROUT::find(sprout::as_iterator(s), sprout::as_iterator(s, n), '\0')
			);
	}
}	// namespace sprout

#endif	// #ifndef SPROUT_CSTRING_STRLEN_HPP