Using class as key in NSDictionary

Question

I\'m writing a contextual \"factory\" that will maintain a dictionary of converter/acting objects which inherit from some Converter class. This class has a method:

Answer 1

While a Class object makes a perfectly good key in an NSDictionary, it's worth mentioning NSMapTable, which is modeled after NSDictionary, but provides more flexibility as to what kind of objects are suitable for use as keys and/or values, documented to support weak references and arbitrary pointers.