From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: Pass by reference
Date: Mon, 12 Apr 2004 12:29:27 +0200
Date: 2004-04-12T12:29:27+02:00 [thread overview]
Message-ID: <c5dr34$gkic$4@ID-77047.news.uni-berlin.de> (raw)
In-Reply-To: 87n05i4rdp.fsf@deneb.enyo.de
Florian Weimer wrote:
> "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> writes:
>
>> Because that could be a handle requiring Initialize/Adjust/Finalize. To
>> be honest, forcing tagged types to be by-reference was probably a
>> mistake.
>
> It's hard to envision another efficient way of implementing
> dispatching calls.
Why? Dispatching does not depend on the way an object is passed. For
example, let you have a by-copy T and Foo (Object : in out T); is a
primitive operaton:
X : T'Class;
Foo (X);
-- Selects Foo according the type tag in X
-- Copies the T part of X (calls Adjust)
-- Calls the selected Foo with the copy
-- Finalizes the T part of X (calls Finalize)
-- Copies possibly modified T back into X (calls Adjust)
-- Finalizes the copy (calls Finalize)
When T is in a register it might be more efficient than by-reference. But
let the compiler decide it knows better.
--
Regards,
Dmitry A. Kazakov
www.dmitry-kazakov.de
next prev parent reply other threads:[~2004-04-12 10:29 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-04-08 14:52 Pass by reference Dan McLeran
2004-04-08 18:21 ` Martin Krischik
2004-04-09 12:53 ` Dan McLeran
2004-04-13 12:42 ` Martin Krischik
2004-04-08 19:04 ` Jim Rogers
2004-04-09 3:24 ` Dan McLeran
2004-04-09 0:01 ` Stephen Leake
2004-04-09 12:38 ` Dan McLeran
2004-04-09 13:03 ` Dmitry A. Kazakov
2004-04-09 19:09 ` Dan McLeran
2004-04-10 10:49 ` Dmitry A. Kazakov
2004-04-11 12:43 ` Florian Weimer
2004-04-12 10:29 ` Dmitry A. Kazakov [this message]
2004-04-12 12:29 ` Samuel Tardieu
2004-04-13 8:46 ` Dmitry A. Kazakov
2004-04-10 1:42 ` Stephen Leake
2004-04-10 16:05 ` chris
2004-04-09 12:44 ` Dan McLeran
2004-04-09 22:44 ` Randy Brukardt
2004-04-09 14:44 ` Simon Wright
2004-04-09 1:15 ` Jeffrey Carter
2004-04-09 1:28 ` Pat Rogers
2004-04-10 1:05 ` Jeffrey Carter
2004-04-09 12:57 ` Dan McLeran
2004-04-10 1:16 ` Jeffrey Carter
2004-04-09 4:03 ` Steve
2004-04-09 14:50 ` Simon Wright
2004-04-09 17:12 ` Pat Rogers
2004-04-09 19:33 ` Vinzent 'Gadget' Hoefler
2004-04-10 6:33 ` Simon Wright
2004-04-13 10:26 ` Vinzent 'Gadget' Hoefler
2004-04-14 17:27 ` Simon Wright
2004-04-15 9:43 ` Vinzent 'Gadget' Hoefler
2004-04-17 7:59 ` Simon Wright
2004-04-11 12:45 ` Florian Weimer
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