description:
deleting NULL pointers have no effect. deleting a pointer to a base class which points to a derived object is legal assuming the base destructor is virtual. deleting an array of objects using a base class pointer is undefined.
deleting NULL pointers have no effect. deleting a pointer to a base class which points to a derived object is legal assuming the base destructor is virtual. deleting an array of objects using a base class pointer is undefined.
