- (BOOL) containsIndex:(ULONG)index

- (BOOL) containsIndexes:(OBIndexSet *)other

- (BOOL) containsIndexesInRange:(OBRange)range

- (ULONG) count

- (ULONG) firstIndex

- (ULONG) getIndexes:(ULONG *)buffer maxCount:(ULONG)capacity inIndexRange:(OBRange *)range

- (ULONG) indexGreaterThanIndex:(ULONG)index

- (ULONG) indexGreaterThanOrEqualToIndex:(ULONG)index

- (ULONG) indexLessThanIndex:(ULONG)index

- (ULONG) indexLessThanOrEqualToIndex:(ULONG)index

- (BOOL) intersectsIndexesInRange:(OBRange)range

- (BOOL) isEqualToIndexSet:(OBIndexSet *)other

- (ULONG) lastIndex