Non-Virtual Multiple Inheritance

Virtual inheritance is used to avoid multiple copies of a base class in a multiple-inherited object. However, there are cases where multiple copies of a base are needed in a derived class. In such cases, virtual inheritance is intentionally avoided. Suppose you have a scrollbar class that serves as a base for two other subclasses:

   class Scrollbar{    private: int x; int y;    public:  void Scroll(units n);   //

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