From: Mario Amado Alves <maa@di.fct.unl.pt>
To: comp.lang.ada@ada.eu.org
Subject: Re: S'Write and How To Count Bytes
Date: 2000/10/03
Date: 2000-10-03T11:03:03+00:00 [thread overview]
Message-ID: <Pine.LNX.4.10.10010031157240.1663-100000@lexis.di.fct.unl.pt> (raw)
The "bottom line" was very simple: you may define the representation in
primary storage but not in secondary. This is what the ARM prescribes. I
also would like to see this changed in Ada20XX.
On Mon, 2 Oct 2000 tmoran@bix.com wrote:
> >... I will get out what I expect.
> type Temperature is new Integer range 60 .. 80;
> for Temperature'size use 8; -- or 7
> Is a Temperature'Write going to produce one byte, because that's how
> big Temperature is, or 4 bytes, because that's how big Integer is?
> type R is record
> Speed : Long_Integer;
> end record;
> for R use record
> S at 0 range 0 .. 7;
> end record;
> Will an R'Write produce one byte for S, or 8 or what?
>
> >A perfect solution would be controlled representation of the (tagged)
> >record types and a fast overlay of a Stream_Element_Array.
> I remember this discussion, but not the bottom line. What's wrong
> with
> TAG_SIZE : constant := 4;
> ...
> type This_Buffer is new Buffer with record
> Speed : Integer;
> T : Temperature;
> end record;
> for This_Buffer use record
> Speed at TAG_SIZE range 0 .. 7;
> T at Tag_Size+1 range 0 .. 7;
> end record;
> and then overlay a Stream_Element_Array? (Or a
> System.Storage_Elements.Storage_Array?)
> I'd rather trust to TAG_SIZE being 4, or at least a single thing to
> change, as I move between compilers, rather than trusting Stream stuff.
>
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next reply other threads:[~2000-10-03 0:00 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-10-03 0:00 Mario Amado Alves [this message]
2000-10-03 0:00 ` S'Write and How To Count Bytes Marin David Condic
2000-10-03 0:00 ` Rep clause problems, was " tmoran
2000-10-03 0:00 ` Marin David Condic
2000-10-04 0:00 ` Simon Wright
2000-10-06 0:00 ` Marin David Condic
2000-10-07 0:00 ` Simon Wright
-- strict thread matches above, loose matches on Subject: below --
2000-10-02 0:00 tmoran
2000-10-03 5:21 ` Marin David Condic
2000-09-30 0:00 Marin David Condic
2000-10-01 0:00 ` David C. Hoos, Sr.
2000-10-02 0:00 ` Dr. Joachim Schr�er
2000-10-02 0:00 ` Marin David Condic
2000-10-06 0:00 ` Charles Hixson
2000-10-02 0:00 ` Marin David Condic
2000-10-02 0:00 ` Ted Dennison
2000-10-02 0:00 ` tmoran
2000-10-02 0:00 ` Marin David Condic
2000-10-02 0:00 ` tmoran
2000-10-02 0:00 ` Marin David Condic
2000-10-11 0:00 ` Nick Roberts
2000-10-11 0:00 ` Marin David Condic
2000-10-02 0:00 ` Ted Dennison
2000-10-03 0:00 ` Robert A Duff
2000-10-06 0:00 ` Randy Brukardt
2000-10-07 0:11 ` Ted Dennison
2000-10-06 0:00 ` Randy Brukardt
2000-10-07 0:00 ` Marin David Condic
2000-10-08 0:00 ` Jean-Pierre Rosen
2000-10-09 0:00 ` Randy Brukardt
2000-10-11 0:00 ` Marin David Condic
2000-10-02 0:00 ` David C. Hoos, Sr.
2000-10-02 6:58 ` tmoran
2000-10-02 0:00 ` Marin David Condic
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