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Virtual Base Classes
This ambiguity can be resolved if the class derived have only one copy of the class base. This can be done by making the base class a virtual class. This keyword makes the two classes share a one copy of their base class . It can be done as follows :
class base
{
:
};
class Aclass : virtual public base
class Bclass : virtual public base
class derived : public Aclass, public Bclass
This will resolve the ambiguity included.
No. it's not required The C++ language guarantees that delete p will do nothing if p is equivalent to NULL. As you might get the test backwards, and as most testing methodologie
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