This is true. I was just trying to implement something as close as possible to what the original poster asked for with respect to his toy problem, which was recomputation of c whenever a or b was set. Of course it's be easy to modify things to use a cache; e.g. set c to nil (or some other convenient marker) whenever a or b is set and put a :before method on the method c that computes and sets the slot c it if it is nil.
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