From: Robert A Duff <bobduff@shell01.TheWorld.com>
Subject: Re: issue with implementing a visitor design pattern
Date: 26 Jan 2004 15:18:41 -0500
Date: 2004-01-26T15:18:41-05:00 [thread overview]
Message-ID: <wccllnubh0e.fsf@shell01.TheWorld.com> (raw)
In-Reply-To: sjj910dp4afg8eprr0is06943dgp2cphh6@4ax.com
Dmitry A. Kazakov <mailbox@dmitry-kazakov.de> writes:
> On 24 Jan 2004 16:44:02 -0500, Robert A Duff
> <bobduff@shell01.TheWorld.com> wrote:
>
> >Dale Stanbrough <MrNoSpam@bigpoop.net.au> writes:
> >
> >> Robert A Duff wrote:
>
> >Adding "case on 'Tag" to Ada would not be trivial. One would have to
> >reconcile the open-ended type extension capability of tagged types with
> >the full-coverage rules of case statements.
>
> Same as with integer types, an obligatory:
>
> when others =>
> ...
"when others" *defeats* the full-coverage rules. It should be used only
if you know it covers *all* the other cases, including the ones that
haven't been invented yet!
> Then, of course, there could be subtypes of classes and thus finite
> sets of tags:
Maybe...
- Bob
next prev parent reply other threads:[~2004-01-26 20:18 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-01-15 19:22 issue with implementing a visitor design pattern cl1
2004-01-17 3:41 ` Robert I. Eachus
2004-01-17 21:24 ` Robert A Duff
2004-01-24 20:38 ` Dale Stanbrough
2004-01-24 21:44 ` Robert A Duff
2004-01-26 8:34 ` Dmitry A. Kazakov
2004-01-26 20:18 ` Robert A Duff [this message]
2004-01-27 8:36 ` Dmitry A. Kazakov
2004-02-01 0:32 ` Georg Bauhaus
2004-01-17 23:05 ` cl1
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