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Exam 15: Polymorphism and Virtual Functions

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Question 21

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Give some simple recommendation for when a destructor should be declared virtual.

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The base class destructor should always ...

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Question 22

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In C++,a virtual destructor is invoked whenever a virtual constructor was used to create the object.

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Question 23

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Virtual functions allow old code to call new code.

Is there an error? class B { public: void virtual f(); }; void B::f(){/*...*/}

Why do you not get an undefined reference in virtual table error when you don't define a pure virtual function?

This is legal code. class B { public: // ... virtual void f()= 0; }; int main(){ B b1,b2;/*...*/ }

What is the error? class B { public: virtual void f(); }; virtual void B::f(){/*...*/}

The virtual function mechanism binds the "right" function to objects.

In a class,functions declared with the virtual keyword need not be defined.

The base class destructor must be virtual.

Destructors are automatically virtual.

If the override specifier is added to the end of a member function declaration,what happens if the function is not specified as virtual in the parent class?

Explain the difference between virtual functions,late binding,and polymorphism.

It is useful to define a class for which no objects may be defined.