From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: High-Integrity OO and controlled types
Date: Mon, 2 May 2011 09:59:33 +0200
Date: 2011-05-02T09:59:33+02:00 [thread overview]
Message-ID: <cyto1lalneg3$.lfdeey81xgqv.dlg@40tude.net> (raw)
In-Reply-To: wccoc3mcdp5.fsf@shell01.TheWorld.com
On Sun, 01 May 2011 17:29:10 -0400, Robert A Duff wrote:
> Maciej Sobczak <see.my.homepage@gmail.com> writes:
>
>> "Controlled types are not supported since they require extensive run-
>> time support."
A prejudice
>> This is surprising to me. I don't see anything in controlled types
>> that would require "extensive run-time support".
>
> Most of the "extensive run-time support" comes from heap-allocated
> objects containing controlled parts.
>
> If you say (for example, perhaps in a nested scope):
>
> type A is access T'Class;
> type T2 is new T with ...;
> X : A := new T2'(...);
[...]
> Finalization also needs to deal with partially-initialized objects,
> and finalize exactly those subcomponents that were successfully
> initialized.
>
> That's all "extensive run-time support".
No, that is an extensive run-time support of dynamically allocated
controlled objects. Any dynamically allocated object requires run-time
support (e.g. heap), which can be considered extensive.
Regarding Finalization, that is not "support", it is a part of the type's
semantics. In this sense the ADD instruction is a run-time support of
Integer type, and thus the whole program's code is "support" of itself.
--
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de
next prev parent reply other threads:[~2011-05-02 7:59 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-01 20:38 High-Integrity OO and controlled types Maciej Sobczak
2011-05-01 21:29 ` Robert A Duff
2011-05-01 22:44 ` Simon Wright
2011-05-02 7:59 ` Dmitry A. Kazakov [this message]
2011-05-02 16:32 ` Robert A Duff
2011-05-02 19:39 ` Dmitry A. Kazakov
2011-05-03 0:08 ` Robert A Duff
2011-05-03 7:30 ` Dmitry A. Kazakov
2011-05-03 16:51 ` Robert A Duff
2011-05-02 9:50 ` Cyrille
2011-05-02 10:01 ` Cyrille
2011-05-02 19:25 ` Maciej Sobczak
2011-05-03 9:32 ` Cyrille
2011-05-03 9:59 ` Maciej Sobczak
2011-05-03 10:24 ` Dmitry A. Kazakov
2011-05-03 16:53 ` Robert A Duff
2011-05-03 17:37 ` Dmitry A. Kazakov
2011-05-03 11:28 ` Georg Bauhaus
2011-05-03 12:27 ` Dmitry A. Kazakov
2011-05-03 15:22 ` Georg Bauhaus
2011-05-03 16:28 ` Dmitry A. Kazakov
2011-05-04 8:48 ` Georg Bauhaus
2011-05-04 9:28 ` Dmitry A. Kazakov
2011-05-04 14:46 ` Georg Bauhaus
2011-05-04 15:01 ` Dmitry A. Kazakov
2011-05-04 15:25 ` Georg Bauhaus
2011-05-04 16:23 ` Dmitry A. Kazakov
2011-05-04 17:06 ` Georg Bauhaus
2011-05-04 20:16 ` Dmitry A. Kazakov
2011-05-05 7:13 ` Maciej Sobczak
2011-05-05 10:58 ` Cyrille
2011-05-05 12:35 ` Dmitry A. Kazakov
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