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One of the four pillars of object-oriented programming (OOP), inheritance establishes a "is-a" relationship between objects. For example, a "Cat" object can be treated in code as any other "Animal" object because a "Cat" is-a "Animal".

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Design dilemma: extensibility vs simplicity

In my opinion, a better approach (along similar lines) is to avoid abstract base classes and instead use generic "policy" classes. You informally define an interface for each behaviour, and mix them i …
Mike Seymour's user avatar