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NNTP-Posting-Date: Tue, 16 Jan 2007 17:06:41 -0600
From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
References: <eog0g5$2bn$1@cernne03.cern.ch> <45acd36e$1@news.post.ch>
Subject: Re: Structured exception information (task, ANEX E)
Date: Tue, 16 Jan 2007 17:07:37 -0600
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Date: 2007-01-16T17:07:37-06:00
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"Martin Krischik" <krischik@users.sourceforge.net> wrote in message
news:45acd36e$1@news.post.ch...
> Maciej Sobczak schrieb:
>
> > Yes, I'm asking for "throwing objects", in the C++ parlance.
> >
> > How to do this in Ada?
> > If I cannot - how to solve this design problem?
>
> I believe this was skipped in Ada because of ANEX E and task types. You
> must understand that Ada exceptions quite often propagated across thread
> borders and sometimes - if ANEX E is implemented - over a network
> connections to another computer.
>
> I do not say this is impossible but it could be quite expensive
> performance wise.

Possibly, but that's easily solved (now) by requiring any such types to
support external streaming. The problem was that we didn't have the concept
of external streaming at the time that we considered extra information for
exceptions (the language had it, but it wasn't defined consistently and it
didn't have a name).

I suspect it would be quite a bit easier to define now than it was in 2002
(although there would certainly be some gotcha).

                             Randy.