Create an iterator object that can be used to iterate through the
values. Caller is responsible for calling roaring_free_iterator.
The iterator is initialized. If there is a value, then it->has_value is true.
The first value is in it->current_value. The iterator traverses the values
in increasing order.
Create an iterator object that can be used to iterate through the values. Caller is responsible for calling roaring_free_iterator. The iterator is initialized. If there is a value, then it->has_value is true. The first value is in it->current_value. The iterator traverses the values in increasing order.
This function calls roaring_init_iterator.