The function used to compare pointers.
Original signature is '@property BOOL (*isEqualFunction)(const void *item1, const void*item2, NSUInteger (*size)(const void *item))'
Available in Mac OS X v10.5 and later.


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