From: Brian Rogoff <bpr@shell5.ba.best.com>
Subject: Re: Subverting 'Access for Sub-programs
Date: 1999/08/04
Date: 1999-08-04T00:00:00+00:00 [thread overview]
Message-ID: <Pine.BSF.4.10.9908042121260.29130-100000@shell5.ba.best.com> (raw)
In-Reply-To: wccbtcnfzr3.fsf@world.std.com
On Wed, 4 Aug 1999, Robert A Duff wrote:
> Anton Gibbs <agibbs@dera.gov.uk> writes:
>
> > Here, the problem is retaining visibility of the parameter F within the
> > procedure whose 'Access I am trying to pass to the Perform operation. If
> > I move Print_If_Multiple out to its own package (ie. out of the scope of
> > Not_Main) then the only way I can see F is by using global data. I know
> > this will work but I am reluctant to adopt this approach because I have
> > often found that non-re-entrant code bites back in years to come when it
> > gets re-used (usually by me) in a way the author never originally
> > intended.
>
> There is no good solution to this problem: no solution that is portable,
> concise, reentrant, &c.
>
> One thing you can do is declare a tagged type, and use an extension as
> the environment of the procedure you want to pass -- then instead of
> passing a procedure as a parameter, pass an object of the class-wide
> type.
This workaround would be a lot more effective if you could extend the
tagged type at a deeper accessibility level than the parent. But you know
that :-)
-- Brian
next prev parent reply other threads:[~1999-08-04 0:00 UTC|newest]
Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-08-03 0:00 Subverting 'Access for Sub-programs Anton Gibbs
1999-08-03 0:00 ` Brian Rogoff
1999-08-03 0:00 ` Michael F. Yoder
1999-08-03 0:00 ` David C. Hoos, Sr.
1999-08-05 0:00 ` Robert A Duff
1999-08-03 0:00 ` Ted Dennison
1999-08-03 0:00 ` Steve Doiel
1999-08-03 0:00 ` tmoran
1999-08-04 0:00 ` Anton Gibbs
1999-08-04 0:00 ` Robert A Duff
1999-08-04 0:00 ` Brian Rogoff [this message]
1999-08-05 0:00 ` tmoran
1999-08-05 0:00 ` Robert Dewar
1999-08-05 0:00 ` Ray Blaak
1999-08-06 0:00 ` Jean-Pierre Rosen
1999-08-06 0:00 ` Hyman Rosen
1999-08-07 0:00 ` Florian Weimer
1999-08-06 0:00 ` Robert Dewar
1999-08-06 0:00 ` Robert A Duff
1999-08-08 0:00 ` Brian Rogoff
1999-08-09 0:00 ` Robert A Duff
1999-08-10 0:00 ` Brian Rogoff
1999-08-09 0:00 ` Tucker Taft
1999-08-05 0:00 ` Aidan Skinner
1999-08-05 0:00 ` Anton Gibbs
1999-08-04 0:00 ` Jean-Pierre Rosen
1999-08-04 0:00 ` Brian Rogoff
1999-08-05 0:00 ` Jean-Pierre Rosen
1999-08-05 0:00 ` Robert A Duff
1999-08-05 0:00 ` Robert Dewar
1999-08-05 0:00 ` tmoran
1999-08-06 0:00 ` Robert A Duff
1999-08-05 0:00 ` Brian Rogoff
1999-08-06 0:00 ` Robert Dewar
1999-08-09 0:00 ` Tucker Taft
1999-08-10 0:00 ` Robert Dewar
1999-08-11 0:00 ` Dmitry A. Kazakov
1999-08-11 0:00 ` Robert Dewar
1999-08-12 0:00 ` Dmitry A. Kazakov
1999-08-14 0:00 ` Robert Dewar
1999-08-16 0:00 ` Dmitry A. Kazakov
1999-08-11 0:00 ` Richard D Riehle
1999-08-11 0:00 ` Robert A Duff
1999-08-11 0:00 ` Robert Dewar
1999-08-11 0:00 ` Tucker Taft
1999-08-13 0:00 ` Robert Dewar
1999-08-13 0:00 ` Robert Dewar
1999-08-13 0:00 ` Brian Rogoff
1999-08-05 0:00 ` adam
1999-08-05 0:00 ` Robert Dewar
1999-08-05 0:00 ` What is a Display ? (was: Subverting 'Access for Sub-programs) Larry Kilgallen
1999-08-05 0:00 ` Hyman Rosen
1999-08-06 0:00 ` Robert Dewar
1999-08-06 0:00 ` Robert Dewar
1999-08-05 0:00 ` Subverting 'Access for Sub-programs adam
1999-08-06 0:00 ` Robert A Duff
1999-08-06 0:00 ` adam
1999-08-09 0:00 ` Mark Biggar
1999-08-09 0:00 ` Robert A Duff
1999-08-06 0:00 ` Brian Rogoff
1999-08-07 0:00 ` Gautier
1999-08-05 0:00 ` Robert A Duff
1999-08-05 0:00 ` Robert Dewar
1999-08-05 0:00 ` Brian Rogoff
1999-08-05 0:00 ` Steve Quinlan
1999-08-04 0:00 ` Robert Dewar
1999-08-04 0:00 ` Robert A Duff
1999-08-04 0:00 ` Robert Dewar
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