std::ranges::subrange<I,S,K>::size

constexpr /* see below */ size() const     requires (K == ranges::subrange_kind::sized);		(since C++20)

Obtains the number of elements in the subrange.

The return type is the corresponding unsigned version of std::iter_difference_t<I>.

Parameters

(none)

Return value

s_ - i_ explicitly converted to the return type, where i_ and s_ are the stored iterator and sentinel respectively, if the size is not stored.

Otherwise, the stored size.

Notes

The size is stored into a subrange if and only if K == ranges::subrange_kind::sized but std::sized_sentinel_for<S, I> is not satisfied.

Example

This section is incomplete Reason: no example

See also

empty (C++20)	checks whether the subrange is empty (public member function)
sizessize (C++17)(C++20)	returns the size of a container or array (function template)
ranges::size (C++20)	returns an unsigned integer equal to the size of a range (customization point object)