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From: Stephen Leake <stephen_leake@acm.org>
Newsgroups: comp.lang.ada
Subject: Re: exception parameters
Date: 11 Apr 2004 09:20:10 -0400
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Date: 2004-04-11T09:20:10-04:00

Georg Bauhaus <sb463ba@l1-hrz.uni-duisburg.de> writes:

> Wojtek Narczynski <wojtek@power.com.pl> wrote:
> :   raise Bang( Hard, Urgent, -1);
> 
> Absent tasks, if I jump long with parameters, doesn't this parameter
> passing mechanism for "exceptional gotos" create a situation where
> program flow is just as hard to follow, or even more so because
> the tasking protocol won't be taken into account?

Yes, it could be abused.

But there are places where it would be useful. 

For example, I'm working on a database GUI. The low-level database
interface raises Database_Error with a string parameter. I have to
parse the string to get the actual database error code. It would be
simpler, and actually clearer, if the error code were avaialble as a
parameter.

I understand there are lots of difficult implementation issues with
general exception parameters, and it can certainly be carried too far.

Ada allows one string parameter for exceptions. If it also allowed one
integer parameter, that might be a nice compromise :).

-- 
-- Stephe