The Oberon companion - a guide to using and programming Oberon System 3
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چکیده
ly, we see from the discussion above that Oberon uses a type extension hierarchy for messages too. This allows us to extend the message protocols of objects without changing or recompiling the whole system. Before proceeding with the text message protocol, we illustrate the message hierarchy in Figure 5.7. Objects.ObjMsg Display.FrameMsg Text frame msg protocol Base message protocols Other fram protocols Oberon.CaretMsg Oberon.SelectMsg
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