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std::ranges::subrange_kind

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

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https://en.cppreference.com/w/cpp/ranges/subrange_kind