From: "Jeffrey R. Carter" <spam.jrcarter.not@spam.not.acm.org>
Subject: Re: syntaxic exploration
Date: Sat, 23 Dec 2017 17:23:29 +0100
Date: 2017-12-23T17:23:29+01:00 [thread overview]
Message-ID: <p1lvu2$ve9$1@dont-email.me> (raw)
In-Reply-To: <fa5e95Fr2nkU1@mid.individual.net>
On 12/22/2017 11:11 PM, Niklas Holsti wrote:
>
> I think the aggregate form (null array) was suggested some time ago, in analogy
> with the existing (null record). It looks good to me, but as I remember, there
> was some objection. One problem is that if the index type has exactly one value,
> then a null array with that index type cannot exist (because then A'First =
> A'Last for any such array A).
Actually, a null array of such a type can exist if it's a string type, because
you can use the string literal "" for such types. AIUI, 'Last is undefined for
such a value. Allowing (null array) for non-string array types with an index
type with a single value would presumably work the same.
--
Jeff Carter
"The time has come to act, and act fast. I'm leaving."
Blazing Saddles
36
next prev parent reply other threads:[~2017-12-23 16:23 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-20 17:28 syntaxic exploration Mehdi Saada
2017-12-20 17:32 ` Mehdi Saada
2017-12-20 20:08 ` Niklas Holsti
2017-12-20 22:18 ` Mehdi Saada
2017-12-20 22:45 ` Mehdi Saada
2017-12-21 7:24 ` Randy Brukardt
2017-12-21 7:44 ` Niklas Holsti
2017-12-21 7:21 ` Randy Brukardt
2017-12-21 16:24 ` Jeffrey R. Carter
2017-12-22 5:01 ` Robert Eachus
2017-12-22 21:15 ` Simon Clubley
2017-12-22 22:11 ` Niklas Holsti
2017-12-22 22:51 ` Dmitry A. Kazakov
2017-12-23 7:15 ` Niklas Holsti
2017-12-23 16:23 ` Jeffrey R. Carter [this message]
2017-12-24 3:37 ` Robert Eachus
2017-12-24 13:39 ` Niklas Holsti
2017-12-24 13:32 ` Niklas Holsti
2017-12-25 13:40 ` Jeffrey R. Carter
2017-12-25 14:42 ` Mehdi Saada
2017-12-25 17:03 ` Dmitry A. Kazakov
2017-12-25 18:27 ` Niklas Holsti
2017-12-25 20:12 ` Jacob Sparre Andersen
2017-12-20 20:05 ` Niklas Holsti
2017-12-20 22:48 ` Mehdi Saada
2017-12-20 23:39 ` Mehdi Saada
2017-12-21 0:35 ` Mehdi Saada
2017-12-21 7:18 ` Randy Brukardt
2017-12-21 19:23 ` G. B.
2017-12-21 23:46 ` bj.mooremr
2017-12-22 23:45 ` Randy Brukardt
2017-12-22 13:31 ` Mehdi Saada
2017-12-22 18:00 ` Mehdi Saada
2017-12-22 18:27 ` Niklas Holsti
2017-12-22 20:25 ` Mehdi Saada
2017-12-22 22:33 ` Niklas Holsti
2017-12-23 1:47 ` Mehdi Saada
2017-12-23 7:17 ` Niklas Holsti
2017-12-23 11:23 ` Mehdi Saada
2017-12-23 11:39 ` Mehdi Saada
2017-12-23 12:09 ` Niklas Holsti
2017-12-23 12:12 ` Mehdi Saada
2017-12-23 12:16 ` Mehdi Saada
2017-12-23 13:04 ` Niklas Holsti
2017-12-23 14:02 ` Mehdi Saada
2017-12-23 14:46 ` Mehdi Saada
2017-12-23 15:03 ` Mehdi Saada
2017-12-23 22:11 ` Niklas Holsti
2017-12-24 0:55 ` Mehdi Saada
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