From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: Ada Annoyances
Date: Tue, 27 Jun 2017 18:32:00 +0200
Date: 2017-06-27T18:32:00+02:00 [thread overview]
Message-ID: <oiu1a0$1qou$1@gioia.aioe.org> (raw)
In-Reply-To: 0f43638d-8954-4db2-94a3-b6615754da34@googlegroups.com
On 2017-06-27 17:19, AdaMagica wrote:
> Am Montag, 26. Juni 2017 22:35:34 UTC+2 schrieb Maciej Sobczak:
>> When executed, we get:
>>
>> test with Base
>> call from Base's Initialize
>> Hello from Base
>> test with Derived
>> call from Base's Initialize
>> Hello from Derived <<<<<<< here are dragons!
>> call from Derived's Initialize
>> Hello from Derived
>
> Yes, this *is* a problem.
No, it is misunderstanding of what Initialize procedure is. It is a
class-wide constructor and not a type-specific constructor like in C++.
This is per language design, willingly or not. Therefore it is OK to
dispatch from Initialize because:
1. All components are initialized
2. Initialize is overrides
If the intent is to use Initialize as a poor-mans substitute for a
type-specific constructor, then you call parent's Initialize *and* you
don't dispatch.
If you use it as a class-wide constructor you can dispatch but you don't
call parent's part. Usually parents class-wide subroutines can be used
to factor out common initialization code.
You can mix both approaches, but with utter care, because this is how
mess starts.
> The following uses *functions* instead (which behave more like C++'s constructors).
Yes, if they return a specific type.
--
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de
next prev parent reply other threads:[~2017-06-27 16:32 UTC|newest]
Thread overview: 116+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-21 1:12 Ada Annoyances pythoner6
2017-06-21 10:13 ` Lucretia
2017-06-23 15:27 ` raph.amiard
2017-06-23 17:49 ` Randy Brukardt
2017-06-23 19:21 ` Niklas Holsti
2017-06-24 4:02 ` Shark8
2017-06-24 19:55 ` Simon Wright
2017-06-24 20:56 ` Niklas Holsti
2017-06-25 23:43 ` Randy Brukardt
2017-06-26 20:20 ` Niklas Holsti
2017-06-26 21:47 ` Randy Brukardt
2017-06-26 22:23 ` Dmitry A. Kazakov
2017-06-29 19:00 ` Niklas Holsti
2017-06-29 21:29 ` Robert A Duff
2017-06-30 0:50 ` Randy Brukardt
2017-07-03 20:39 ` Robert A Duff
2017-07-04 19:52 ` Niklas Holsti
2017-07-04 19:32 ` Niklas Holsti
2017-06-30 0:47 ` Randy Brukardt
2017-06-30 18:45 ` Niklas Holsti
2017-06-30 20:06 ` Robert A Duff
2017-06-29 21:12 ` Robert A Duff
2017-07-04 19:30 ` Niklas Holsti
2017-07-05 20:03 ` Robert A Duff
2017-06-23 19:22 ` Niklas Holsti
2017-06-30 15:02 ` Norman Worth
2017-06-30 23:49 ` pythoner6
2017-07-03 0:04 ` Randy Brukardt
2017-07-03 17:47 ` Jere
2017-07-03 19:43 ` Dmitry A. Kazakov
2017-07-04 2:18 ` Randy Brukardt
2017-12-17 13:47 ` Prefixed notation for non tagged types Jere
2017-12-17 15:06 ` Simon Wright
2017-12-17 15:33 ` Dmitry A. Kazakov
2017-12-18 22:31 ` Randy Brukardt
2017-12-19 0:40 ` Jere
2017-12-19 23:04 ` Randy Brukardt
2017-12-20 12:33 ` Robert Eachus
2017-06-21 11:58 ` Ada Annoyances joakimds
2017-06-21 12:29 ` Pascal Obry
2017-06-21 14:52 ` pythoner6
2017-06-21 16:11 ` J-P. Rosen
2017-06-21 16:12 ` Dmitry A. Kazakov
2017-06-21 22:45 ` pythoner6
2017-06-22 7:29 ` Dmitry A. Kazakov
2017-06-22 10:29 ` pythoner6
2017-06-22 11:04 ` Egil H H
2017-06-22 13:30 ` Dmitry A. Kazakov
2017-06-22 19:22 ` Niklas Holsti
2017-06-22 21:52 ` Dmitry A. Kazakov
2017-06-23 9:33 ` AdaMagica
2017-06-23 10:25 ` Simon Wright
2017-06-23 1:00 ` pythoner6
2017-06-23 15:23 ` raph.amiard
2017-06-23 16:10 ` Dmitry A. Kazakov
2017-06-23 17:41 ` Randy Brukardt
2017-06-23 18:56 ` Maciej Sobczak
2017-06-23 22:18 ` pythoner6
2017-06-24 8:05 ` Dmitry A. Kazakov
2017-06-24 8:35 ` Maciej Sobczak
2017-06-24 9:07 ` Dmitry A. Kazakov
2017-06-24 20:50 ` Maciej Sobczak
2017-06-24 21:06 ` Dmitry A. Kazakov
2017-06-25 11:33 ` Maciej Sobczak
2017-06-25 14:32 ` Dmitry A. Kazakov
2017-06-25 20:50 ` Maciej Sobczak
2017-06-26 7:58 ` Dmitry A. Kazakov
2017-06-26 13:24 ` Maciej Sobczak
2017-06-26 16:38 ` Dmitry A. Kazakov
2017-06-26 20:42 ` Maciej Sobczak
2017-06-24 8:34 ` Maciej Sobczak
2017-06-24 13:06 ` pythoner6
2017-06-24 15:40 ` Dmitry A. Kazakov
2017-06-26 0:06 ` Randy Brukardt
2017-06-26 20:35 ` Maciej Sobczak
2017-06-26 21:40 ` Randy Brukardt
2017-06-27 7:23 ` Maciej Sobczak
2017-06-27 20:38 ` Randy Brukardt
2017-06-28 8:21 ` Dmitry A. Kazakov
2017-06-28 20:50 ` Randy Brukardt
2017-06-28 23:18 ` Nasser M. Abbasi
2017-06-29 7:27 ` Dmitry A. Kazakov
2017-06-29 16:24 ` Jeffrey R. Carter
2017-06-29 16:51 ` Nasser M. Abbasi
2017-07-04 23:40 ` Luke A. Guest
2017-07-05 5:29 ` J-P. Rosen
2017-07-05 13:49 ` Dennis Lee Bieber
2017-07-05 17:49 ` Jeffrey R. Carter
2017-06-29 21:46 ` darkestkhan
2017-06-29 7:15 ` Dmitry A. Kazakov
2017-06-30 0:42 ` Randy Brukardt
2017-06-30 7:36 ` Dmitry A. Kazakov
2017-06-28 13:07 ` Maciej Sobczak
2017-06-27 7:26 ` Dmitry A. Kazakov
2017-06-27 20:41 ` Randy Brukardt
2017-06-28 7:57 ` Dmitry A. Kazakov
2017-06-27 15:19 ` AdaMagica
2017-06-27 16:32 ` Dmitry A. Kazakov [this message]
2017-06-28 13:15 ` Maciej Sobczak
2017-06-28 14:05 ` AdaMagica
2017-06-29 21:17 ` Robert A Duff
2017-06-30 7:44 ` Dmitry A. Kazakov
2017-06-30 7:49 ` J-P. Rosen
2017-06-30 8:28 ` Dmitry A. Kazakov
2017-06-30 10:14 ` J-P. Rosen
2017-06-30 10:30 ` Dmitry A. Kazakov
2017-06-28 20:53 ` Randy Brukardt
2017-12-17 16:24 ` Mehdi Saada
2017-12-17 17:27 ` Dmitry A. Kazakov
2017-12-18 23:09 ` Randy Brukardt
2017-12-19 9:25 ` Dmitry A. Kazakov
2017-06-21 20:40 ` G.B.
2017-06-21 22:25 ` pythoner6
2017-06-26 11:01 ` Vincent
2017-06-26 11:15 ` Alejandro R. Mosteo
2017-06-26 16:35 ` Pascal Obry
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