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Newsgroups: comp.lang.ada
Subject: Re: Structured exception information
From: Georg Bauhaus <bauhaus@futureapps.de>
In-Reply-To: <utzy6oyql.fsf@stephe-leake.org>
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Date: Thu, 01 Feb 2007 15:17:04 +0100
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Date: 2007-02-01T15:16:53+01:00
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On Thu, 2007-02-01 at 07:20 -0500, Stephen Leake wrote:
> Georg Bauhaus <bauhaus@arcor.de> writes:
> 
> > On Mon, 2007-01-29 at 21:15 -0500, Stephen Leake wrote:
> >
> >> Have you worked on a real system where this approach was used, and was
> >> in fact better than having the programmers write the error messages?
> >
> > I worked ...
> >
> > [Some] people didn't ...
> 
> Ok, so the answer to my question is "no".

Well, actually, there have been at least two programmers who did try
to write meaningful exception messages and who have derived an exception
type. The objects were used in handlers further out in the call chain.

Changing the software to have better error handling had made us
find out about a few obscure behaviors of the software, of course.
The original developer had left, so we couldn't ask
him about the whys and whens of the silent handlers.


> So I'm talking about having control over the _entire_ system, and you
> are talking about third party libraries. That is different.

OK, but talking about third party Ada libraries makes sense when
discussing exception types as they will be additions to Ada,
a language for large distributed systems?