Anybody explain me what is virtual point and where it will use and when and why?
1. Wrong forum
2. There is no such thing as a "virtual pointer", I think you are mismatching words from different things.
I think that the virtual pointer can be a reference in WWW.:)
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I think you're referring to a pointer to a virtual table function table.
They're used in polymorphism to allow overriding of base methods.