std::ranges::subrange_kind

< cpp‎ | ranges
Defined in header <ranges>
enum class subrange_kind : bool {

    unsized,
    sized

};
(since C++20)

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

Constant Explanation
unsized specifies that the subrange does not model sized_range
sized specifies that the subrange does model sized_range