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Destructors of base classes should be declared virtual:
class Shape {
public:
virtual void draw() = 0; // pure virtual
virtual ~Shape(); // virtual destructor
};//class Shape
Otherwise, destruction of a derived object via a base reference or pointer is (gasp!) undefined...
...so even the base part may not be properly destroyed!
This means you can't really safely inherit from classes with non-virtual destructors.
Maybe just make all destructors virtual?
Well, this is a size issue.
Any class with a virtual function should certainly have a virtual destructor.
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