On 20/05/2009, at 10:49 PM, Roland King wrote:
subclass AA off A, add your ivars there and sub B, C and D off AA instead?
Ah, I should have made it clearer that all of A, B C and D are in the framework, and the additional functionality belongs to an app which includes the framework. The class relationships between A and B, C, D are already established in the framework and can't be changed. Adding the app functionality to the framework doesn't make sense, as the additional code is very esoteric while the framework is general purpose.
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