std::ranges::subrange_kind

From cppreference.com
< cpp‎ | ranges
Ranges library
Range adaptors
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

Constants

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