From: Dmitry A. Kazakov <mailbox@dmitry-kazakov.de>
Subject: Re: issue with implementing a visitor design pattern
Date: Mon, 26 Jan 2004 09:34:28 +0100
Date: 2004-01-26T09:34:28+01:00 [thread overview]
Message-ID: <sjj910dp4afg8eprr0is06943dgp2cphh6@4ax.com> (raw)
In-Reply-To: wcc4qult42l.fsf@shell01.TheWorld.com
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 =>
...
Then, of course, there could be subtypes of classes and thus finite
sets of tags:
type T is tagged ...;
type T1 is new T with ...;
type T2 is new T1 with ...;
...
type TN is new ...;
subtype Finite is T'Class (T1..TN);
Also useful would be dispatching on bare tags or an equivalent of
that.
--
Regards,
Dmitry A. Kazakov
www.dmitry-kazakov.de
next prev parent reply other threads:[~2004-01-26 8:34 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 [this message]
2004-01-26 20:18 ` Robert A Duff
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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