15.7.1. Virtual Destructors
The primary direct impact that inheritance has on copy control for a base class is that a base class generally should define a virtual destructor (§15.2.1, p. 594). The destructor needs to be virtual to allow objects in the inheritance hierarchy to be dynamically allocated.
Recall that the destructor is run when we delete a pointer to a dynamically allocated object (§13.1.3, p. 502). If that pointer points to a type in an inheritance hierarchy, it is possible that the static type of the pointer might differ from the dynamic type of the object being destroyed (§15.2.2, p. 597). For example, if we delete a pointer of ...
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