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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: Common exception handling
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Date: Wed, 27 Aug 2008 10:16:40 +0200
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On Tue, 26 Aug 2008 13:22:03 -0700 (PDT), Maciej Sobczak wrote:

> On 26 Sie, 21:14, "Dmitry A. Kazakov" <mail...@dmitry-kazakov.de>
> wrote:
> 
>> I wished to have ranges of exceptions
> 
> Hierarchies, not ranges.

Yes, but it is still a range, technically, a bounded set. The problem is
that this set can be infinite. Such structure of an ordered set have real
numbers, strings, and, of course, type hierarchies.
 
> The difference is that entities in the hierarchy can be not only
> extended but also specialized and that would nicely fit in the OO part
> of the language.

Extension = specialization in classic OO (and Ada). When a type is extended
by adding new members and/or methods it is a specialization of the class
rooted in the derivation base.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de