From: "Jean-Pierre Rosen" <rosen.adalog@wanadoo.fr>
Subject: Re: controlled type in generic package?
Date: Fri, 9 Feb 2001 09:51:25 +0100
Date: 2001-02-09T09:51:25+01:00 [thread overview]
Message-ID: <f1c069.v1e.ln@skymaster.axlog.fr> (raw)
In-Reply-To: 95tpba$9va$1@nnrp1.deja.com
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<dmitry6243@my-deja.com> a �crit dans le message news: 95tpba$9va$1@nnrp1.deja.com...
>[...]
> > procedure P is
> > type Child is new Parent with...;
> > procedure Proc (X : Child) is... end Proc;
> > begin
> > V := new Child;
> > end P;
> >
>
> This is an issue of how dispatch tables are implemented and maintained
> at run-time. One could imagine a mechanism that would restore the
> dispatch table, when a derived type goes away. The type tag could
> be "redirected" to the base type tag, or the table slots corresponding
> to the overriden methods could be restored etc. What is really nasty,
> is that the semantic of V.Proc would depend on the context.
>
No, you miss the point. A (dispatching) call to P.Proc could access P's local variables, but such variables would not exist at the
time P.Proc is called.
--
---------------------------------------------------------
J-P. Rosen (Rosen.Adalog@wanadoo.fr)
Visit Adalog's web site at http://pro.wanadoo.fr/adalog
next prev parent reply other threads:[~2001-02-09 8:51 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-02-06 11:06 controlled type in generic package? Nils Priebe
[not found] ` <slrn97vtf5.ho.lutz@taranis.iks-jena.de>
[not found] ` <95q19j$9d$1@usenet.rational.com>
2001-02-07 10:11 ` Lutz Donnerhacke
2001-02-07 21:57 ` Mark Lundquist
[not found] ` <95p2ab$463$1@nnrp1.deja.com>
2001-02-07 15:08 ` Jean-Pierre Rosen
2001-02-08 15:41 ` Ted Dennison
2001-02-08 18:21 ` Jean-Pierre Rosen
2001-02-08 16:31 ` Florian Weimer
2001-02-08 21:10 ` Brian Rogoff
2001-02-09 10:39 ` Florian Weimer
2001-02-09 17:02 ` Brian Rogoff
2001-02-09 18:45 ` Florian Weimer
2001-02-13 0:32 ` Nick Roberts
2001-02-14 0:30 ` Jon S Anthony
[not found] ` <x7vg0hd20cm.fsf@smaug.pushface.org>
[not found] ` <hovk6.96$aw5.304@www.newsranger.com>
2001-02-23 20:50 ` Simon Wright
[not found] ` <95q1fa$9e$1@usenet.rational.com>
2001-02-07 15:28 ` Ted Dennison
2001-02-07 16:29 ` Brian Rogoff
[not found] ` <3A82A66D.49DE7EBD@bton.ac.uk>
2001-02-08 15:15 ` Robert Dewar
2001-02-08 16:56 ` Florian Weimer
2001-02-09 10:25 ` John English
2001-02-09 19:46 ` Brian Rogoff
2001-02-07 18:52 ` Pat Rogers
2001-02-07 19:23 ` Pat Rogers
2001-02-07 19:50 ` Ted Dennison
2001-02-07 22:52 ` Jean-Pierre Rosen
2001-02-08 9:36 ` dmitry6243
2001-02-09 8:51 ` Jean-Pierre Rosen [this message]
2001-02-09 12:28 ` dmitry6243
2001-02-08 19:58 ` Mark Lundquist
2001-02-10 9:54 ` Thomas Wolf
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