From:	dbell-hvp AT m140 DOT aone DOT net DOT au (David JD Bell)
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Hello, question, probably been asked a billion times before.
Date:	Mon, 31 Mar 1997 06:52:59 GMT
Organization:	Hidden Valley Plantations
Lines:	23
Message-ID:	<333f5de7.18493796@news.mcy.aone.net.au>
References:	<199703270107 DOT UAA01491 AT hcst DOT net>
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To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

"Bryan Murphy" <bf461 AT cleveland DOT freenet DOT edu> wrote:

>And, what does undefined reference to OBJECT virtual table mean
>anyways?
>
I was going to ask exactly the same question. I got the same thing
and as far as I can tell it was when I used a class BASE pointer to
'new' a class DERIVED variable, where DERIVED is a subclass of BASE
and contains some virtual functions, and where the constructor for
DERIVED has a BASE in the argument list. The program compiled OK but
the error was in the linking.

I think it had something to do with confusion over constructor calls,
because it had to construct the BASE in the argument list (which could
be a DERIVED) before it could construct DERIVED. Any way after mucking
around with the constructors, in particular changing the DERIVED
constructor argument to *BASE, the problem went away.

But I would still like to know what "undefined reference to OBJECT
virtual table" means and was going to ask at one of the gnu.g++
newsgroups. Hope this is of assistance.

David JD Bell, Hidden Valley Plantations, Australia.

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