NSMapTable and NSMutableDictionary differences

Question

Is an NSMapTable the same as an NSMutableDictionary except for allowing keys to be pointers?

Does it differ in memory management?

Answer 1

More or less, it has some additional options that are primarily relevant if you use Garbage Collection (which is sort of deprecated, I guess). If you don't use Garbage Collection, the memory management requirements are the same.

Another difference is that NSMapTable can optionally use pointer equality for hashing.