Virtual function member : A member function that can be declared within a base class is known as virtual function. A derived class can redefine a virual function member. Preceding the function declaration, a keyword “virtual” is used for creating a virtual function in base class. While inheriting a class with virtual function, the virtual function is redefined by the derived class as per its needs. Virtual function call is been resolved at the run time whereas non virtual member functions resolves at compile time. Virtual function call is computationally more expensive than function call that is non virtual. Virtual functions use pointer invocation, indirection and a few extra instructions are required than normal member functions. The constructor of any class that would contain virtual functions are been required to initialize a table of pointers to its virtual member functions. Non-virtual function member : Non virtual function members are resolved statistically. Non virtual member function is been selected statically based on the type of pointer to the object. Unlike virtual function member, no runtime activities happens in non virtual member functions, since the compiler resoles non virtual functions at compile time based on the type of pointer.

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Chapter 1, Problem 14E

Program Plan Intro

Virtual function member :

A member function that can be declared within a base class is known as virtual function.

A derived class can redefine a virual function member.

Preceding the function declaration, a keyword “virtual” is used for creating a virtual function in base class.

While inheriting a class with virtual function, the virtual function is redefined by the derived class as per its needs.

Virtual function call is been resolved at the run time whereas non virtual member functions resolves at compile time.

Virtual function call is computationally more expensive than function call that is non virtual.

Virtual functions use pointer invocation, indirection and a few extra instructions are required than normal member functions.

The constructor of any class that would contain virtual functions are been required to initialize a table of pointers to its virtual member functions.

Non-virtual function member :

Non virtual function members are resolved statistically.

Non virtual member function is been selected statically based on the type of pointer to the object.

Unlike virtual function member, no runtime activities happens in non virtual member functions, since the compiler resoles non virtual functions at compile time based on the type of pointer.

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