From: Jack Mitchell <jack@home9999.plus.com>
Subject: Re: not null
Date: Thu, 5 Mar 2009 19:53:53 +0000
Date: 2009-03-05T19:53:53+00:00 [thread overview]
Message-ID: <1O2AmTBR3CsJFw5x@plus.com> (raw)
In-Reply-To: qcauq45pgq84rvntrggh90hdd68ji6btl2@4ax.com
In message <qcauq45pgq84rvntrggh90hdd68ji6btl2@4ax.com>, Brian Drummond
<brian_drummond@btconnect.com> writes
>On Wed, 4 Mar 2009 08:09:56 -0800 (PST), Adam Beneschan
><adam@irvine.com> wrote:
>
>>On Mar 4, 6:56 am, Hyman Rosen <hyro...@mail.com> wrote:
>>> Georg Bauhaus wrote:
>>> > As said to have been seen on /.
>>> > another financial disaster, again caused
>>> > by making references to nothing, in Algol W,
>>> >http://qconlondon.com/london-2009/presentation/Null+References:+The+B...
>>>
>>> You are misreading the abstract. First of all, it's not
>>> about some particular incident. He's talking about the
>>> overall impact. Second, he's not talking about failure
>>> to check for null references, he's talking about having
>>> null references at all, so Ada is no better.
>>
>>I'm having difficulty understanding the point. You have to have the
>>idea of the lack of a reference. How else would you implement a
>>linked list abstraction?
>
>Possibly by pointing from the end back to the list head.
>
>It would make the "end of list" test more expensive (the head might have to be
>kept in a register or passed around as another argument). I don't think
>it would
>be pretty, but can't see any fundamental reason why it shouldn't work.
>
>- Brian
The other way to avoid needing null references is to point back not to
the start of the list, but to your self.
--
Jack Mi_Remove_tchell
next prev parent reply other threads:[~2009-03-05 19:53 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 [this message]
2009-03-05 8:49 ` Jacob Sparre Andersen
2009-03-05 16:10 ` Adam Beneschan
2009-03-05 17:20 ` Jacob Sparre Andersen
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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