I have a base class in a framework, let's call it A. This has a number
of subclasses, B C and D.
I have some functionality I'd like to add that would apply to all A,
B, C and D. So a category on A would be fine - except that I need some
support in the form of a couple of ivars. The added functionality
isn't appropriate to the framework, so though I have the source for A,
adding ivars that have no place there grieves me.
It also grieves me that the solution appears to be separate subclasses
of B, C and D to add the functionality which must be duplicated for
each class.
Any solution I've missed?
--Graham
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