From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: APQ
Date: Wed, 22 Dec 2004 14:15:42 +0100
Date: 2004-12-22T14:15:42+01:00 [thread overview]
Message-ID: <1qdghglptbxd0.4agztqguu8nm.dlg@40tude.net> (raw)
In-Reply-To: 1297625.Y25m4Ds50U@linux1.krischik.com
On Wed, 22 Dec 2004 11:07:44 +0100, Martin Krischik wrote:
> Warren W. Gay VE3WWG wrote:
>
>> I can't imagine it making a practical difference here, but
>> perhaps I lack imagination on this point.
>
> http://en.wikibooks.org/wiki/Programming:Ada:Types:access#access_vs._access_all
Pool-specific access types do not do well:
1. Upcast/downcast conversions do not work. You'll need
Unchecked_Conversion of pointers. It is nasty and dangerous.
2. '[Unchecked_]Access does not work (otherwise, (1) would be a minor
problem).
3. Rosen's trick does not work. Very bad. Move it to Initialize? That won't
work either, because of 2.
4. Construction/destruction is headache. Wished to insert a newly created
object into a list? Not from Initialize! To delete it from there upon
destruction? Nay!
5. Access discriminants cannot be pool-specific. Converting to general
access to specific one is again an Unchecked_Conversion of worst kind.
6. There is no way to restrict objects allocations to a definite set of
pools. "type X (<>) is ..." does not count.
In general, I think that the issue should be thoroughly reworked.
--
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de
next prev parent reply other threads:[~2004-12-22 13:15 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-12-15 23:31 APQ Brian May
2004-12-16 11:34 ` APQ Warren W. Gay VE3WWG
2004-12-16 23:58 ` APQ Randy Brukardt
2004-12-17 3:45 ` APQ Brian May
2004-12-17 4:03 ` APQ Warren W. Gay VE3WWG
2004-12-17 4:38 ` APQ Brian May
2004-12-17 9:06 ` APQ Egil H. H�vik
2004-12-17 11:42 ` APQ Brian May
2004-12-17 22:55 ` APQ Brian May
2004-12-18 15:52 ` APQ Warren W. Gay VE3WWG
2004-12-18 18:23 ` APQ Dmitry A. Kazakov
2004-12-21 23:34 ` APQ Brian May
2004-12-22 8:57 ` APQ Dmitry A. Kazakov
2004-12-22 10:07 ` APQ Martin Krischik
2004-12-22 13:15 ` Dmitry A. Kazakov [this message]
2004-12-22 16:53 ` APQ Martin Krischik
2004-12-22 17:21 ` APQ Dmitry A. Kazakov
2004-12-22 18:23 ` APQ Martin Krischik
2004-12-17 8:59 ` APQ Stephen Leake
2004-12-17 14:12 ` APQ Dmitry A. Kazakov
2004-12-17 23:20 ` APQ Brian May
2004-12-18 16:13 ` APQ Dmitry A. Kazakov
2004-12-21 23:29 ` APQ Brian May
2004-12-22 9:14 ` APQ Dmitry A. Kazakov
2005-01-04 21:32 ` APQ Brian May
2005-01-05 11:58 ` APQ Dmitry A. Kazakov
2004-12-23 17:04 ` APQ (Connection Cloning) Warren W. Gay VE3WWG
2004-12-23 17:55 ` Georg Bauhaus
2004-12-23 18:52 ` Warren W. Gay VE3WWG
2005-01-03 7:40 ` Frank Piron
2004-12-17 13:54 ` APQ Dmitry A. Kazakov
-- strict thread matches above, loose matches on Subject: below --
2004-12-16 4:37 APQ Christoph Karl Walter Grein
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