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Any class that may act as the base of another class should
have a virtual destructor. This ensures that when an object
of the derived class is destroyed that the derived class
dtor will be invoked to destroy it. If the destructor is not
virtual, under some common circumstances, only the base
class' destructor will be invoked, regardless of the class
actually being destroyed. For practical purposes this means
that a class which does, could or should have virtual member
functions, should also have a virtual destructor.
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