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What does it mean when "virtual" is in "class Foo : public virtual Bar" as opposed to "virtual void frob()"?
For a given method there are 8 cases stemming from the presence or absence of virtual in the following three locations.
I think I understand how numbers 1 and 3 interact but number 2 seems redundant. Is it? What am I not understanding?
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virtual functions can be private . This is because private means that the function cannot be called by derived classes. It does not prevent the entry to the v-table being overwritten. This means that the both the base class and the derived class will have access to the overwritten virtual function.
A virtual function is a member function that you expect to be redefined in derived classes. When you refer to a derived class object using a pointer or a reference to the base class, you can call a virtual function for that object and execute the derived class's version of the function.
As i said the "virtual" comes for free on free functions, you dont have to declare it as virtual, the only thing you have to do is to put a & next to the parameter.
That's virtual inheritance, you do it when you know you'll be doing multiple inheritance. That page goes into way more detail.
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