From: bobduff@world.std.com (Robert A Duff)
Subject: Re: To Initialise or not
Date: 1996/05/08
Date: 1996-05-08T00:00:00+00:00 [thread overview]
Message-ID: <Dr3yzz.52C@world.std.com> (raw)
In-Reply-To: 31909E74.1E09@lmtas.lmco.com
In article <31909E74.1E09@lmtas.lmco.com>,
Ken Garlington <garlingtonke@lmtas.lmco.com> wrote:
>Robert A Duff wrote:
>>
>> Well, sort of. The use of an invalid representation will not
>> necessarily be detected in all cases.
>
>In what case would 'Valid not detect an invalid representation?
Heh? I said, "all cases". The 'Valid attribute is *one* case. I
meant, pragma Normalize_Scalars will not cause every read of an
uninitialized scalar to be detected. Am I confused? I thought we were
talking about pragma Normalize_Scalars, not the 'Valid attribute.
>For scalar X, X'Valid "yields True if and only if the object
>denoted by X is normal and has a valid representation."
Yes. But be careful -- anything that's erroneous will negate that rule.
>Certainly, if there is _no_ invalid representation of X, then
>'Valid won't detect any. However, you should be able to use 'Size
>to force the existence of an invalid representation for any
>scalar, right?
No, I don't think so. An implementation might allow it, but where does
the RM require an implementation to accept such a Size clause? (Note:
The ARG is considering some AI's related to this issues, notably AI's 51
and 109, in case you care to comment.)
- Bob
next prev parent reply other threads:[~1996-05-08 0:00 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
1996-04-29 0:00 To Initialise or not Steve O'Neill
1996-04-29 0:00 ` Ken Garlington
1996-04-29 0:00 ` Robert Dewar
1996-04-30 0:00 ` Ken Garlington
1996-04-30 0:00 ` Robert A Duff
1996-04-30 0:00 ` Ken Garlington
1996-04-30 0:00 ` Robert A Duff
1996-05-01 0:00 ` Keith Thompson
1996-05-01 0:00 ` Theodore E. Dennison
1996-05-01 0:00 ` Robert A Duff
1996-05-02 0:00 ` Michael F Brenner
1996-05-02 0:00 ` Robert A Duff
1996-05-04 0:00 ` Kevin D. Heatwole
1996-05-02 0:00 ` Theodore E. Dennison
1996-05-02 0:00 ` Chris Warack <sys mgr>
1996-05-02 0:00 ` Robert A Duff
1996-05-06 0:00 ` Ken Garlington
1996-05-02 0:00 ` Robert A Duff
1996-05-06 0:00 ` Ken Garlington
1996-05-07 0:00 ` Robert A Duff
1996-05-08 0:00 ` Ken Garlington
1996-05-08 0:00 ` Robert A Duff [this message]
1996-05-09 0:00 ` Ken Garlington
1996-05-09 0:00 ` Robert A Duff
1996-05-01 0:00 ` Dale Stanbrough
1996-05-02 0:00 ` Robert Dewar
1996-05-02 0:00 ` Robert A Duff
1996-05-02 0:00 ` Theodore E. Dennison
1996-05-01 0:00 ` Robert A Duff
1996-05-02 0:00 ` Keith Thompson
1996-05-03 0:00 ` Robert A Duff
1996-05-06 0:00 ` Ken Garlington
1996-05-06 0:00 ` Ken Garlington
1996-05-07 0:00 ` Robert A Duff
1996-05-08 0:00 ` Ken Garlington
1996-05-09 0:00 ` Robert A Duff
1996-05-10 0:00 ` Robert A Duff
1996-05-10 0:00 ` Ken Garlington
1996-05-10 0:00 ` Robert A Duff
1996-05-10 0:00 ` Ken Garlington
1996-05-11 0:00 ` David Kristola
1996-05-11 0:00 ` Robert A Duff
1996-05-11 0:00 ` Robert A Duff
1996-05-13 0:00 ` Ken Garlington
1996-05-13 0:00 ` Ken Garlington
1996-05-13 0:00 ` Robert A Duff
1996-05-13 0:00 ` Ken Garlington
1996-05-13 0:00 ` Robert A Duff
1996-05-13 0:00 ` Ken Garlington
1996-04-30 0:00 ` Robert A Duff
1996-05-01 0:00 ` Patrick Richard Wibbeler
1996-05-06 0:00 ` Ken Garlington
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