Returns a Boolean value that indicates whether the hash table contains a given object.
Original signature is '- (BOOL)containsObject:(id)anObject'
Available in Mac OS X v10.5 and later.


- anObject (Id)
- The object to test for membership in the hash table.

YES if the hash table contains anObject, otherwise NO.

- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)