This is basically Spliterator, an iterator + a size, with the iterator is "push" instead of "pull" because it's more efficient. In details a Spliterator is either - an Iterable (with no SIZED characteristic) - an Iterable + size (if SIZED and estimateSize() != Long.MAX_VALUE) - an Iterable + comparator (if SORTED and comparator != null) - an Iterable + split (if trySplit != null) and all combinations of the above.
So, you're asking for Spliterable<T>, no? :)
