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Inheritance or Containment?
I''ve been reading Code Complete lately (which is a great book so far), and the author, Steve McConnell, has some good general advice about when to use Inheritance and when to use Containment when designing your classes:
- If multiple classes share common data but not behavior, create a common object that those classes can contain
- If multiple classes share common behavior but not data, derive them from a common base class that defines the common routines
- If multiple classes share common data and behavior, inherit from a common base class that defines the common data and routines
- Inherit when you want the base class to control your interface; contain when you want to control your interface
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