Re: want to leave virtual functions undefined
* kdotk:
I have a class whose member functions are implemented in multiple
compilation unit's (.o). Now, while linking my main program with these
.o's, I can exclude from the link line all those .o's whose member
functions are not called by the main program.
Except for virtual member functions, even if my main program never
calls them, I have to include the corresponding .o's, or else, I get
unsatisified symbols for them which I imagine are coming from the VTABLE.
What's the C++ way to fix this (multiple inheritance ?)
Basically it's Quality Of Implementation issue: your compiler & linker
should have some option to remove unused definitions.
If you have declared a virtual function in a class, you must also
implement it for that class, except if it's pure virtual (in which case
you cannot instantiate the class, so that's not what you want).
--
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