From: Robert Dewar <robert_dewar@my-deja.com>
Subject: Re: Enumeration representation
Date: 1999/09/11
Date: 1999-09-11T00:00:00+00:00 [thread overview]
Message-ID: <7rcceh$anh$1@nnrp1.deja.com> (raw)
In-Reply-To: yecn1uu9xy2.fsf@king.cts.com
In article <yecn1uu9xy2.fsf@king.cts.com>,
Keith Thompson <kst@cts.com> wrote:
If you try to read
> such a value from an external interface, it's very difficult
> to check that you've gotten a valid value without invoking
> erroneous execution (undefined behavior).
No, it is quite easy, do an unchecked conversion of the value
into the enumeration variable, or just read the value in
directly with appropriate low level I/O, then do a 'Valid test.
And Keith, before you go rummaging around legalise in the RM,
be sure to read the relevant AI, whose purpose is basically
to say, yes of course the above works, whatever the RM says :-)
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next prev parent reply other threads:[~1999-09-11 0:00 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-09-10 0:00 Enumeration representation Alex
1999-09-10 0:00 ` Ted Dennison
1999-09-10 0:00 ` Robert Dewar
1999-09-13 0:00 ` Ted Dennison
1999-09-10 0:00 ` Keith Thompson
1999-09-11 0:00 ` Robert Dewar [this message]
1999-09-11 0:00 ` Keith Thompson
1999-09-12 0:00 ` Bryce Bardin
1999-09-13 0:00 ` Robert Dewar
1999-09-13 0:00 ` Keith Thompson
1999-09-13 0:00 ` Robert Dewar
1999-09-12 0:00 ` Keith Thompson
1999-09-13 0:00 ` Robert Dewar
1999-09-13 0:00 ` Keith Thompson
1999-09-14 0:00 ` Robert Dewar
1999-09-13 0:00 ` Ted Dennison
1999-09-13 0:00 ` Robert A Duff
1999-09-13 0:00 ` Robert Dewar
1999-09-10 0:00 ` Matthew Heaney
1999-09-10 0:00 ` Robert Dewar
1999-09-10 0:00 ` David C. Hoos, Sr.
1999-09-10 0:00 ` Robert Dewar
1999-09-13 0:00 ` Alex
-- strict thread matches above, loose matches on Subject: below --
2004-01-01 20:44 Luke A. Guest
2004-01-01 21:45 ` Stephen Leake
2004-01-01 22:01 ` Luke A. Guest
2004-01-02 1:17 ` tmoran
2004-01-02 1:29 ` Stephen Leake
2004-01-02 3:10 ` Luke A. Guest
2004-01-02 2:46 ` Robert A Duff
2004-01-02 3:12 ` Luke A. Guest
2004-01-02 13:58 ` Marin David Condic
2004-01-02 21:39 ` Pat Rogers
2004-01-03 13:42 ` Marin David Condic
2004-01-03 1:53 ` Robert A Duff
2004-01-02 20:52 ` Randy Brukardt
2004-01-02 21:05 ` Luke A. Guest
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