about virtual keyword's use in classes

i know the fact that using a virtual keyword in the derived classes(A & B) derived from one base class(Base) removes the ambiguity of the hidden variable of the base class in derived class C (another one) derived from the two derived classes
......but how???

This section from the C++ FAQ should answer any questions you have about virtual inheritance (but feel free to ask more specific ones if it doesn't).

i want to know that what happens to the variable of base class when you use virtual keyword in dreaded diamond type inheritance

Quote:

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Originally Posted by Mukul Kumar

i want to know that what happens to the variable of base class when you use virtual keyword in dreaded diamond type inheritance

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If you use virtual inheritance correctly, the derived class at the bottom of the hierarchy will only have one sub-object of the base class at the top of the hierarchy.