From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: syntaxic exploration
Date: Fri, 22 Dec 2017 23:51:58 +0100
Date: 2017-12-22T23:51:58+01:00 [thread overview]
Message-ID: <p1k2af$n1q$1@gioia.aioe.org> (raw)
In-Reply-To: fa5e95Fr2nkU1@mid.individual.net
On 2017-12-22 23:11, Niklas Holsti wrote:
> I think the aggregate form (null array) was suggested some time ago, in
> analogy with the existing (null record).
These two totally different things. "null record" is not a record
aggregate (a value of record type), it is a type construct (a value of a
record type's type). Correspondingly "null array" would mean a type of
arrays rather than an empty aggregate of an array type.
> I think (null array) satisfies that. I wish it could be introduced.
If "" is QK, why () isn't?
Empty : My_Array := ();
It could be an attribute as well:
Empty : My_Array := My_Array'Null;
(You are right about indices. String has the lower bound set to 1. That
gives an unambiguous range of an empty string. For general case arrays
it is ambiguous)
--
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de
next prev parent reply other threads:[~2017-12-22 22:51 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 [this message]
2017-12-23 7:15 ` Niklas Holsti
2017-12-23 16:23 ` Jeffrey R. Carter
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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