From: Georg Bauhaus <bauhaus@futureapps.de>
Subject: Re: Generic procedures and their parameters
Date: Thu, 07 Sep 2006 08:48:21 +0200
Date: 2006-09-07T10:46:59+02:00 [thread overview]
Message-ID: <44ffdc83$0$18489$9b4e6d93@newsspool3.arcor-online.net> (raw)
In-Reply-To: <b5ezeh7gqghz.1gpog2d99hu0b$.dlg@40tude.net>
Dmitry A. Kazakov wrote:
> But this all is independent on the question whether interface and
> implementation inheritances are different things. They are not.
Suppose I have some complex number type C
having a lengthy division operation that requires
auxiliary components in the implementation.
Now I want a type of complex numbers just like C
but without a division operation.
One way to do so might seem to inherit a D from C,
and clear the division operation,
type C is tagged private;
...
procedure division(a, b: C; result: in out C);
type D is new C with private;
...
overriding
procedure division(a, b: D; result: in out D) is null;
(Is there anything better than null BTW? It won't remove
division from D's interface...)
This will leave the auxiliary components of C in D.
But couldn't I do better? For example, by declaring
the interface I want, and then requesting that the needed
operations be "extracted" from C, dropping the division
stuff (provided there is a way to mark components as being
needed by only some set of operations.)
I will loose view conversions to C.
But if that is what I want? Just a composition of
the interface I need in some scope?
next prev parent reply other threads:[~2006-09-07 6:48 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-09-06 8:51 Generic procedures and their parameters Maciej Sobczak
2006-09-06 9:43 ` Dmitry A. Kazakov
2006-09-06 12:36 ` Maciej Sobczak
2006-09-06 13:11 ` Robert A Duff
2006-09-06 14:14 ` Maciej Sobczak
2006-09-06 15:09 ` Dmitry A. Kazakov
2006-09-06 16:35 ` Georg Bauhaus
2006-09-07 7:32 ` Dmitry A. Kazakov
2006-09-07 6:48 ` Georg Bauhaus [this message]
2006-09-07 10:19 ` Dmitry A. Kazakov
2006-09-08 9:11 ` Maciej Sobczak
2006-09-08 10:19 ` Dmitry A. Kazakov
2006-09-09 14:49 ` Robert A Duff
2006-09-09 15:34 ` Dmitry A. Kazakov
2006-09-09 23:26 ` Jeffrey R. Carter
2006-09-10 11:49 ` Robert A Duff
2006-09-10 19:43 ` Jeffrey R. Carter
2006-09-06 13:02 ` Robert A Duff
2006-09-06 14:09 ` Dmitry A. Kazakov
2006-09-08 3:35 ` Randy Brukardt
2006-09-08 7:21 ` Dmitry A. Kazakov
2006-09-09 1:29 ` Randy Brukardt
2006-09-09 7:14 ` Dmitry A. Kazakov
2006-09-09 14:32 ` Robert A Duff
2006-09-06 12:56 ` Robert A Duff
2006-09-07 2:47 ` Steve
2006-09-07 7:47 ` Dmitry A. Kazakov
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