What are Virtual Functions?

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tetosoft

Question subject: What are Virtual Functions?

Posted: Wed Jul 04, 2007 12:32 am

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What are Virtual Functions?
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Virtual Functions are the basis of Polymorphism Ø·Â£Ø¢Â¢Ø£Â¢Ã¢â‚¬Ú‘Ø¢Â¬Ø£Â¢Ã¢â€šÂ¬Ø¥â€œ they provide the mechanics of late binding. A class, which has at least one function declared as Virtual has a V-Table associated with it. V-Table maintains pointers of all the Virtual functions of that class.

All objects of that class point to the same V-Table. Whenever there is a call made to a function which is virtual, the pointer to that function is obtained during runtime from the V-Table. Hence there is dynamic binding or late binding that leads to the function of the derived class getting called.

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