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Class Design, Inheritance, and Polymorphism > Virtuality
Chapter 18. Virtuality
Difficulty: 7
In this Item, we delve into old questions with new and/or improved answers. The up-to-date answers to two recurring questions about virtual functions lead directly to four guidelines targeting robust class design. These guidelines answer these questions: why should interfaces be nonvirtual? why should virtuals be private? and what's with the old and hoary advice about base class destructors, and is the old hoary advice really true?
