Wednesday, August 2, 2006

both hasa + isa at the same time

HAS-A has its attractions. IS-A has its powers too. You must choose one or the other. Or must you?

1) Well if you accept additional complexities, Decorator pattern gives you some if not all the combined benefits of composition and inheritance. In one sentence, "A decorator wraps a base object and extends[1] that decoratee object." It's kind of unusual and complex. I think it's good to remember a few examples to justify it.

2) MacroCommand is another design pattern combining both hasa+isa at the same time.

[1] or "implements"

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