From: dmitry@elros.cbb-automation.de (Dmitry Kazakov)
Subject: Re: Thoughts on the ADaOS user program interface
Date: Fri, 07 Sep 2001 08:24:48 GMT
Date: 2001-09-07T08:24:48+00:00 [thread overview]
Message-ID: <3b98827b.3305921@news.cis.dfn.de> (raw)
In-Reply-To: 9n8eks$qsp$1@shell.monmouth.com
On 6 Sep 2001 14:18:04 -0400, ka@sorry.no.email (Kenneth Almquist)
wrote:
>(Note: In addition to the use suggested here, pragma Separate_Tag
>would improve the performance of types like Ada.Strings.Unbounded,
>where a tagged type is required but the tag is rarely used. When this
>pragma is applied to a type, it is not possible to redispatch in the
>primitive subprograms for that type, because that would require using
>the tag in a context where there is no class-wide pointer to the
>object.)
Not only that. If tag is separate, one could make *all* types tagged.
Class-wide values would consist of tag + specific value. Pointers to
class-wides would be tag + pointer to a specific value.
This way one could make Boolean, Integer etc tagged and most of type
attributes ['Value, 'Image ...] dispatching.
Sorry for off-topic, but I could not resist (:-))
Regards,
Dmitry Kazakov
next prev parent reply other threads:[~2001-09-07 8:24 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-09-06 18:18 Thoughts on the ADaOS user program interface Kenneth Almquist
2001-09-07 8:24 ` Dmitry Kazakov [this message]
2001-09-07 16:48 ` Warren W. Gay VE3WWG
2001-09-07 19:35 ` David Starner
2001-09-08 11:42 ` Florian Weimer
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