From: "Warren W. Gay VE3WWG" <ve3wwg@cogeco.ca>
Subject: Re: A community Windows binding
Date: Thu, 14 Oct 2004 12:53:58 -0400
Date: 2004-10-14T12:53:58-04:00 [thread overview]
Message-ID: <Eaybd.26159$hk6.999182@news20.bellglobal.com> (raw)
In-Reply-To: <4168EA68.6D6A2B39@yahoo.com>
CBFalconer wrote:
> Stephen Leake wrote:
>>Jeffrey Carter <spam@spam.com> writes:
>>>Callbacks and dispatching are essentially the same thing in a
>>>windowing system. You have to write little pieces of code that
>>>can be invoked in any order at any time outside your control.
>>>You have to use global variables extensively for these little
>>>pieces of code to communicate. The code is difficult to read
>>>because you have to understand all these little pieces to
>>>understand any part of the software.
>>
>>In Windex, GWindows, CLAW, and GtkAda, each "little piece of
>>code" has as a parameter the user window type. That type stores
>>all the information needed; no global variables are necessary.
>>
>>I can (with a lot of effort to suppress my normal style :)
>>write messy, hard to read code in Windex, using global
>>variables. But it's certainly not required.
>
> I disagree that callbacks and dispatching are essentially the same,
Agreed. In a dispatching program there is too much temptation
for the programmer to have unwanted coupling between the cases
of code (they could share object(s)/variable(s) that were
unintended). In a callback, this risk is reduced because the
object(s)/variable(s) are localized to the callback itself.
--
Warren W. Gay VE3WWG
http://home.cogeco.ca/~ve3wwg
next prev parent reply other threads:[~2004-10-14 16:53 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <usm8shkul.fsf@acm.org>
2004-10-05 23:28 ` A community Windows binding Stephen Leake
2004-10-06 4:26 ` David Botton
2004-10-06 17:42 ` Jeffrey Carter
2004-10-07 16:33 ` Warren W. Gay VE3WWG
2004-10-07 17:37 ` Jeffrey Carter
2004-10-08 2:39 ` Alexander E. Kopilovich
2004-10-08 2:43 ` Nick Roberts
2004-10-08 4:56 ` tmoran
2004-10-08 23:17 ` chris
2004-10-09 1:31 ` Jeffrey Carter
2004-10-09 1:36 ` Jeffrey Carter
2004-10-09 3:15 ` Steve
2004-10-09 6:23 ` tmoran
[not found] ` <z7ybd.26154$hk6.998363@news20.bellglobal.com>
2004-10-15 1:12 ` Stephen Leake
2004-10-15 20:36 ` David Botton
2004-10-17 13:25 ` Stephane Riviere
2004-10-09 13:20 ` Stephen Leake
2004-10-10 9:04 ` CBFalconer
2004-10-10 14:39 ` Stephen Leake
2004-10-14 16:54 ` Warren W. Gay VE3WWG
2004-10-14 16:53 ` Warren W. Gay VE3WWG [this message]
2004-10-10 3:38 ` David Botton
2004-10-14 16:46 ` Warren W. Gay VE3WWG
[not found] ` <rSftVP19_F@VB1162.spb.edu>
2004-10-08 8:18 ` Marius Amado Alves
2004-10-08 1:36 ` Stephen Leake
2004-10-06 4:28 ` CBFalconer
2004-10-06 6:02 ` tmoran
2004-10-06 11:35 ` Georg Bauhaus
2004-10-06 14:04 ` Steve
2004-10-06 6:22 ` Fionn mac Cuimhaill
2004-10-06 17:18 ` Nick Roberts
2004-10-07 6:38 ` Frank Piron
2004-10-07 9:44 ` Ross Higson
2004-10-07 16:39 ` Warren W. Gay VE3WWG
2004-10-07 22:27 ` Ross Higson
[not found] <41664D4E.7040405@netcabo.pt>
2004-10-08 21:38 ` Alexander E. Kopilovich
[not found] <uacv0hhj0.fsf_-_@acm.org>
2004-10-10 18:05 ` Stephen Leake
2004-10-10 18:17 ` Andre
2004-10-10 20:55 ` tmoran
2004-10-11 0:34 ` David Botton
2004-10-11 0:39 ` David Botton
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