From: Simon Wright <simon@pushface.org>
Subject: Re: asynchronous task communication
Date: Tue, 08 Jan 2013 21:14:31 +0000
Date: 2013-01-08T21:14:31+00:00 [thread overview]
Message-ID: <lyvcb7v0lk.fsf@pushface.org> (raw)
In-Reply-To: kci1g0$997$1@dont-email.me
Jeffrey Carter <spam.jrcarter.not@spam.not.acm.org> writes:
> On 01/08/2013 11:18 AM, Simon Wright wrote:
>> Jeffrey Carter <spam.jrcarter.not@spam.not.acm.org> writes:
>>
>>> If you have an item in your (unbounded) array, indexed by Positive, at
>>> index 3, it will still be at index 3 if you assign to components at
>>> other indices, or extend the array by adding new components beyond the
>>> current end of the array. However, if you insert a new component
>>> before the existing item at index 3, then all the components after the
>>> new component will shift up, and the existing item will then be at
>>> index 4.
>>>
>>> One would think that a Cursor would behave similarly.
>>
>> Not so! The Cursor becomes ambiguous[1], and using it is a bounded
>> error. GNAT GPL 2012 implements Cursor using an Index, & behaves the way
>> you'd expect.
>
> To my mind, that is Cursor behaving similarly. Just as the index 3 is
> no longer the index of the item in question, so the Cursor should not
> be relied on.
In AdaCore's implementation, yes. But another implementation might
validly raise PE. To my mind, that'd be preferable.
next prev parent reply other threads:[~2013-01-08 21:14 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-31 0:16 asynchronous task communication Charles Hixson
2012-12-31 9:04 ` Simon Wright
2012-12-31 11:49 ` Simon Wright
2012-12-31 10:50 ` J-P. Rosen
2012-12-31 12:09 ` Georg Bauhaus
2012-12-31 18:52 ` Charles Hixson
2012-12-31 20:18 ` Shark8
2012-12-31 21:09 ` Niklas Holsti
2012-12-31 22:15 ` Randy Brukardt
2013-01-01 3:58 ` Charles Hixson
2013-01-01 4:48 ` tmoran
2013-01-01 17:59 ` Charles Hixson
2013-01-01 3:51 ` Charles Hixson
2013-01-01 9:59 ` Dmitry A. Kazakov
2013-01-01 10:38 ` Brian Drummond
2013-01-01 12:32 ` Jeffrey Carter
2013-01-01 18:21 ` Charles Hixson
2013-01-01 18:54 ` Robert A Duff
2013-01-02 7:36 ` Charles Hixson
2013-01-02 9:55 ` Dmitry A. Kazakov
2013-01-02 19:02 ` Charles Hixson
2013-01-02 20:35 ` Dmitry A. Kazakov
2013-01-03 0:20 ` Charles Hixson
2013-01-03 6:34 ` Charles Hixson
2013-01-03 8:50 ` Dmitry A. Kazakov
2013-01-03 19:01 ` Charles Hixson
2013-01-03 10:01 ` J-P. Rosen
2013-01-03 19:29 ` Charles Hixson
2013-01-04 8:17 ` J-P. Rosen
2013-01-05 4:31 ` Charles Hixson
2013-01-09 8:34 ` Stephen Leake
2013-01-03 22:27 ` Randy Brukardt
2013-01-05 5:18 ` Charles Hixson
2013-01-05 8:48 ` Niklas Holsti
2013-01-06 22:55 ` Charles Hixson
2013-01-07 0:38 ` tmoran
2013-01-07 6:07 ` Shark8
2013-01-07 10:49 ` Brian Drummond
2013-01-07 18:27 ` Jeffrey Carter
2013-01-08 12:02 ` Brian Drummond
2013-01-08 17:12 ` Jeffrey Carter
2013-01-08 18:18 ` Simon Wright
2013-01-08 20:29 ` Dmitry A. Kazakov
2013-01-08 21:01 ` Jeffrey Carter
2013-01-08 21:14 ` Simon Wright [this message]
2013-01-08 22:11 ` Randy Brukardt
2013-01-08 22:52 ` Jeffrey Carter
2013-01-08 22:26 ` Brian Drummond
2013-01-08 2:41 ` Randy Brukardt
2013-01-02 22:43 ` Niklas Holsti
2013-01-03 1:30 ` Charles Hixson
2013-01-03 12:11 ` Georg Bauhaus
2013-01-03 13:17 ` Dmitry A. Kazakov
2013-01-05 20:19 ` Charles Hixson
2013-01-07 4:01 ` Shark8
2013-01-01 19:59 ` J-P. Rosen
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