23 Iterators library [iterators]

23.5 Iterator adaptors [predef.iterators]

23.5.6 Counted iterators [iterators.counted]

23.5.6.3 Accessors [counted.iter.access]

constexpr I base() const;
Effects: Equivalent to: return current;
constexpr iter_difference_t<I> count() const noexcept;
Effects: Equivalent to: return length;