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[Mark Roszko <mark.roszko@xxxxxxxxx>]

>It is redundant (you cannot override a non-virtual function)

a() and b() in struct c in the example are virtual in both parents.


override is simply a check to tell the compiler you intend to override
a() and b() from parent classes.

If you put virtual blah() in struct C without override, you can be
creating a new virtual function if the signature does not match and
its completely valid.