From: dewarr@my-dejanews.com
Subject: Re: Future Ada language revisions?
Date: 1998/10/05
Date: 1998-10-05T00:00:00+00:00 [thread overview]
Message-ID: <6vbh5h$4ro$1@nnrp1.dejanews.com> (raw)
In-Reply-To: 3618DAE7.326A@oen.siemens.de
In article <3618DAE7.326A@oen.siemens.de>,
Alfred.Hilscher@oen.siemens.de wrote:
> I have an other question to the Ada95 design: Why does Ada not support
> simple PROCEDURE-Types (like C or Modula). When writing GUI
> applications, one needs always to pass callback routines. They are in
> fact passed as procedure variables. In Ada one have to pass adresses
> instead. While Ada has task type, I did not found any procedure type. Is
> there really none (and if, why not) or am I blind ?
This is a bit peculiar, perhaps you have been looking at an obsolete language
(Ada 83). In Ada 95, there is an access procedure type which does exactly what
you want. Very similar to, but safer than, the use of procedure pointers in C.
This feature was primarily motivated by the need to support callbacks and has
been widely and successfully used for this purpose.
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next prev parent reply other threads:[~1998-10-05 0:00 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
1998-09-27 0:00 Future Ada language revisions? bpr5549
1998-09-27 0:00 ` Larry Kilgallen
1998-09-27 0:00 ` Brian Rogoff
1998-09-28 0:00 ` dewarr
1998-09-28 0:00 ` Brian Rogoff
1998-09-29 0:00 ` Michael F Brenner
1998-10-02 0:00 ` Fergus Henderson
1998-09-29 0:00 ` Larry Kilgallen
1998-09-28 0:00 ` Michael F Brenner
1998-09-28 0:00 ` dewarr
1998-09-28 0:00 ` Arthur Evans Jr
1998-09-28 0:00 ` dewarr
1998-09-28 0:00 ` dewar
1998-10-05 0:00 ` Alfred Hilscher
1998-10-05 0:00 ` Tucker Taft
1998-10-05 0:00 ` dewarr [this message]
1998-10-06 0:00 ` Alfred Hilscher
1998-10-05 0:00 ` Brian Rogoff
1998-10-05 0:00 ` dewarr
1998-10-02 0:00 ` Robert I. Eachus
1998-10-03 0:00 ` Brian Rogoff
1998-10-05 0:00 ` dewarr
1998-10-04 0:00 ` Brian Rogoff
1998-10-05 0:00 ` Martin Dowie
1998-10-05 0:00 ` dewarr
1998-10-05 0:00 ` Niklas Holsti
1998-10-05 0:00 ` Martin Dowie
1998-10-06 0:00 ` r_barton1
1998-10-06 0:00 ` dennison
1998-10-06 0:00 ` dennison
1998-10-06 0:00 ` dewarr
1998-10-06 0:00 ` Martin Dowie
1998-10-06 0:00 ` Martin Dowie
1998-10-06 0:00 ` Matthew Heaney
1998-10-06 0:00 ` Robert I. Eachus
1998-10-06 0:00 ` Brian Rogoff
1998-10-07 0:00 ` dewarr
[not found] ` <tgmF02yDo.A84@netcom.com>
1998-10-06 0:00 ` Matthew Heaney
1998-10-08 0:00 ` dennison
1998-10-08 0:00 ` Pat Rogers
1998-10-08 0:00 ` Brian Rogoff
1998-10-09 0:00 ` dennison
1998-10-16 0:00 ` Robert A Duff
-- strict thread matches above, loose matches on Subject: below --
1998-10-21 0:00 Van Snyder
1998-10-22 0:00 ` Robert A Duff
1998-10-21 0:00 ` Brian Rogoff
1998-10-23 0:00 ` Robert I. Eachus
1998-10-29 0:00 ` Robert A Duff
1998-10-30 0:00 ` Brian Rogoff
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