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When
using virtual inheritance, virtual functions can be
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used
in the same way that we learned about previously.
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However,
a class derived from two or more base classes
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that
have a virtual base class in common must override all
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virtual
functions declared in the common base class if it is
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overridden
in more than one of its direct base class
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branches.
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If
virtual functions are not overridden in the derived class,
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it
is impossible to know which of the virtual functions to
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use.
It would be impossible to know which direct base
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class'
virtual function to use! This is because the virtual
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function
is accessed from the common base class pointer
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pointing
to a derived class object.
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