std::ranges::subrange_kind - cppreference.com

From cppreference.com


`enum class subrange_kind : bool { unsized, sized };`		(since C++20)

Specifies if a std::ranges::subrange models std::ranges::sized_range or not.

Enumerator	Meaning
`unsized`	specifies that the `subrange` does not model `sized_range`
`sized`	specifies that the `subrange` does model `sized_range`