From: Jacob Sparre Andersen <sparre@nbi.dk>
Subject: Re: not null
Date: Thu, 05 Mar 2009 18:20:01 +0100
Date: 2009-03-05T18:20:01+01:00 [thread overview]
Message-ID: <ygewsb3opj2.fsf@sparre-andersen.dk> (raw)
In-Reply-To: 4282b420-25a7-47d5-859e-427485dc8bbd@a5g2000pre.googlegroups.com
Adam Beneschan wrote:
> Jacob Sparre Andersen wrote:
>> > Whatever mistakes a programmer could in the actual Ada language
>> > make by forgetting to check whether an access value is null, he
>> > could make in the above example by forgetting to check the
>> > Present discriminant.
>>
>> No. The _compiler_ checks the discriminant. The programmer will
>> get a Constraint_Error if he tries to use "Ref" while "Present" is
>> false.
>
> It also checks access values and raises Constraint_Error if they're
> null, so I don't understand what your point is.
Neither do I. Must have been sleepy.
Greetings,
Jacob
--
A password should be like a toothbrush. Use it every day;
change it regularly; and DON'T share it with friends.
next prev parent reply other threads:[~2009-03-05 17:20 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-04 14:44 not null Georg Bauhaus
2009-03-04 14:56 ` Hyman Rosen
2009-03-04 15:22 ` Georg Bauhaus
2009-03-04 16:16 ` Adam Beneschan
2009-03-05 14:24 ` Georg Bauhaus
2009-03-05 16:07 ` Adam Beneschan
2009-03-06 1:07 ` Hibou57 (Yannick Duchêne)
2009-03-04 16:09 ` Adam Beneschan
2009-03-04 20:38 ` Dmitry A. Kazakov
2009-03-05 1:54 ` Adam Beneschan
2009-03-05 8:42 ` Dmitry A. Kazakov
2009-03-05 1:32 ` Brian Drummond
2009-03-05 1:47 ` Adam Beneschan
2009-03-05 11:32 ` Brian Drummond
2009-03-05 15:06 ` Dmitry A. Kazakov
2009-03-05 13:57 ` Georg Bauhaus
2009-03-05 19:53 ` Jack Mitchell
2009-03-05 8:49 ` Jacob Sparre Andersen
2009-03-05 16:10 ` Adam Beneschan
2009-03-05 17:20 ` Jacob Sparre Andersen [this message]
2009-03-06 1:04 ` Hibou57 (Yannick Duchêne)
2009-03-06 12:01 ` Harald Korneliussen
2009-03-06 12:43 ` Jacob Sparre Andersen
2009-03-06 13:05 ` Harald Korneliussen
2009-03-06 15:21 ` Dmitry A. Kazakov
2009-03-06 16:59 ` Harald Korneliussen
2009-03-06 17:48 ` Dmitry A. Kazakov
2009-03-06 20:05 ` Georg Bauhaus
2009-03-06 21:31 ` Dmitry A. Kazakov
2009-03-04 16:19 ` Robert A Duff
2009-03-04 20:39 ` Colin Paul Gloster
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