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A virtual destructor will be defined for a base class when ALL of the following hold: ^4.1

The destructor in a derived class is different from the base class destructor
Derived class objects may be deleted via a pointer or reference to base class objects.

However, the designer may have reasons for making the destructor virtual when these do not hold.

Use copy constructors sparingly to avoid unecessary overhead.

Watch out for calls by reference and calls by value.

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