RE: [boost] Re: Virtual inheritance in exception hierarchies

From: Alan.Griffiths_at_[hidden]
Date: 2003-09-03 12:10:05

> -----Original Message-----
> From: David Abrahams [mailto:dave_at_[hidden]]
> Sent: 02 September 2003 18:46
> >
> > /2/ Instead of guessing we can ask him.  He is amazingly 
> tolerant of idiot
> > questions.  :)
> 
> Go for it ;-)

Done: here is what he has to say (with my summary of the discussion elided
for brevity)...

> -----Original Message-----
> From: Bjarne Stroustrup [mailto:bs_at_[hidden]]
> Sent: 03 September 2003 16:57
>
> There wasn't much experience with exceptions at the time I 
> wrote that. I saw it 
> in a few examples and extrapolated. Note that the amount of 
> anti-MI hype tends 
> to eliminate even good examples from common use.
> 
> >Are you still of the opinion that this design is both common and good
> >practice?  And have you time to explain why?
> 
> I think that multiple inherited exception can be good design, 
> for all the usual reasons for MI. I don't think we 
> need to go to virtual bases.  That's a 
> complication that I don't see the need for. 
> 
> The example quoted by Dave with the ambiguous what() should - 
> as ever - be resolved by overriding what() in the derived class.

--
Alan Griffiths
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