cpp/ranges/slide view/iterator/operator arith

Advances or decrements the.

Let and  be the underlying iterators to the begin and end of the sliding window.

@1@ Equivalent to:

Before the invocation, the and  (if present) must be incrementable.

@2@ Equivalent to:

@3@ Equivalent to:

Before the invocation, the and  (if present) must be decrementable.

@4@ Equivalent to:

@5@ Equivalent to:

Before the invocation, the expressions and  (if  is present) must have well-defined behavior.

@6@ Equivalent to:

Before the invocation, the expressions and  (if  is present) must have well-defined behavior.

Return value
@1,3,5,6@ @2,4@ a copy of that was made before the change