From:	"mpt" <M DOT P DOT Tidball AT cs DOT cf DOT ac DOT uk>
Newsgroups:	comp.os.msdos.djgpp
Subject:	virtual problems
Date:	Fri, 8 Jan 1999 14:06:37 -0000
Organization:	uwcc
Lines:	66
Message-ID:	<7753dg$ft3$1@loki.cf.ac.uk>
NNTP-Posting-Host:	lab10.cs.cf.ac.uk
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To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp
Reply-To:	djgpp AT delorie DOT com

Here is a test program I wrote and compiled (or tried to) using DJGPP.

It's just a trifle to test the effectiveness of the virtual mechanisms in
C++ (new boy, you see).

When I compiled it as it is, the linker reported several invalid references
to Thing functions, nodes and tables.

When I put some braces on the ends of the function definitions within the
Thing class, the linker was happy (why?).

However, even in this happy state, the program would:

a)    return a bizarre long integer from the first Thing in the vector,
b)    return the same string whichever Thing the second extraction
        used thingVec[ 0 ] or [ 1 ]), and
c)    not fire the Thing_a and Thing_b print functions.

Help!

Pardon the rude words in the code - as you might guess, this problem has
really rammed my rectum.

M

http://www.cs.cf.ac.uk/User/M.P.Tidball/index.html






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end

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