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Let's say we have a concrete class Apple . (Apple objects can be instantiated.) Now, someone comes and derives an abstract class Peach from Apple. It's abstract because it introduces a new pure virtual function. The user of Peach is now forced to derive from it and define this new function. Is this a common pattern? Is this correct to do? Sample: class Apple { public: virtual void MakePie(); // more stuff here }; class Peach : public Apple { public: virtual void MakeDeliciousDesserts() = 0; // more stuff here }; Now let's say we have a concrete class Berry . Someone derives an abstract class Tomato from Berry. It's abstract because it overwrites one of Berry's virtual functions, and makes it pure virtual. The user of Tomato has to re-implement the function previously defined in Berry. Is this a common pattern? Is this correct to do? Sample: class Berry { public: virtual void EatYummyPie(); // more stuff here }; class Tomato : public Berry { public: virtual void EatYummyPie() = 0; // more stuff here }; Note: The names are contrived and do not reflect any actual code (hopefully). No fruits have been harmed in the writing of this question.

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