Method Iterator()->next()

Method next: int next()
Description: If this function is defined it should advance the iterator one step, just like `+= (1) would do.
Note: This is the preferred way to advance the iterator, since it reduces the overhead.
Note: This function was optional in Pike 7.6 and earlier.
Returns: Returns 1 if it succeeded in advancing, and 0 (zero) if it has reached the end of the iterator.
See also: `+ , `+= , `-