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Well, if COM is involved it's quite easily recognizable. The pure virtual class definitions usually look something like this, at least in Microsoft code,


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It's not as much what the compiler or linker sees as what C++ allows and it's perfectly fine to define variables of virtual classes. What you cannot do is creating objects of a virtual class. For...

The panel_get_registered_c_callback function returns a derived object of the IPanelCCallback base type. Object creation functions like this is quite common in OO.

The question is who owns the...