use of vtbl

"Michael BANTLE" <Michael.Bantle@t-systems.de>
6 Aug 2001 03:59:46 -0400

          From comp.compilers
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use of vtbl Michael.Bantle@t-systems.de (Michael BANTLE) (2001-08-06)
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From: "Michael BANTLE" <Michael.Bantle@t-systems.de>
Newsgroups: comp.compilers
Date: 6 Aug 2001 03:59:46 -0400
Organization: Compilers Central
Keywords: C++, question
Posted-Date: 06 Aug 2001 03:59:46 EDT

Hi to all,


Is there any simple explanation out there on how to use the vtbl of a class
directly. The only compiler I found with easy to use information on this
topic is Microsoft's VC++:


        get it:
            VTBLENTRY** pVtbl = (VTBLENTRY**)pClassPointer;


        then use it:
            ((<cast it appropriate>)(*pVtbl)[<index to method>])(pClassPointer,
<additional method parameters>);


Please help me on bare bones like the one shown for Sun and/or GNU.


Thanks to everyone who reads this.


-- Michael
[The structure of vtbl's isn't standardized, although in practice they're
all pretty much the same. -John]


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