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List:       kde-devel
Subject:    Re: dynamic_cast performance overhead
From:       Michael Buesch <mbuesch () freenet ! de>
Date:       2005-06-03 12:27:14
Message-ID: 200506031427.14283.mbuesch () freenet ! de
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Quoting Dirk Mueller <mueller@kde.org>:
> On Thursday 02 June 2005 22:26, Michael Buesch wrote:
> 
> > > Maybe a template function or something similiar would be better.
> > Such as this. This is tested and prints a friendly debug
> > message in DEBUG mode. Otherwise is optimized by the
> > compiler to nothing (normal reinterpret_cast).
> 
> Which is WRONG. I wonder how you tested that.

With single inheritance.

> reinterpret_cast<> doesn't do  
> the base pointer adjustment necessary for multiple inheritance. Don't ever 
> use such code. And even more important, don't ever make other people use such 
> ugly code. 

I don't force anyone to anything.
I did not say this hack was foolproof.

-- 
Greetings, Michael



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