cpp/ranges/slide view/iterator/operator arith2

Performs iterator arithmetic.

@1,2@ Equivalent to:.

@3@ Equivalent to:.

@4@ Let and  be the underlying iterators to the begin and end of the sliding window, respectively. Equivalent to:
 * , if is present. Otherwise,

Return value
@1-2@ An incremented iterator. @3@ A decremented iterator. @4@ A distance between given iterators.