All base classes should have a virtual destructor . If the class should be abstract (you want to prevent instantiating it) but it doesn’t happen to have any other pure virtual functions, a common technique to make the destructor pure virtual:
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A C++ pure virtual function is a virtual function that you want to force derived classes to override. If a class has any non-overridden pure virtuals, it is an “abstract class” and you can’t create objects of that type.
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