cpp/ranges/subrange/prev

Obtains a whose iterator is decremented by  times or incremented by  times respect to that of, when  or  respectively.

Equivalent to. The behavior is undefined if the iterator is decremented after being a non-decrementable value.

Return value
A whose iterator is decremented by  times or incremented by  times respect to that of, when  or  respectively.

Complexity
Generally decrements or  increments on the iterator, when  or  respectively.

Constant if models, and either  or  is modeled.