If an iterator is an output iterator and one of the other categories at the same time, it is a mutable iterator. It can be read from and written to. If we obtain an iterator from a non-const container instance, it will usually be of this kind.
If an iterator is an output iterator and one of the other categories at the same time, it is a mutable iterator. It can be read from and written to. If we obtain an iterator from a non-const container instance, it will usually be of this kind.