From: adam@irvine.com (Adam Beneschan)
Subject: Re: Syntax question
Date: Thu, 16 Mar 1995 19:20:50 GMT
Date: 1995-03-16T19:20:50+00:00 [thread overview]
Message-ID: <D5JsEq.Cnz@irvine.com> (raw)
In-Reply-To: 3jrt1m$9rk@erinews.ericsson.se
etlghh@garbo.ericsson.se (Geoffrey Hollingworth) writes:
>Hi
>
>I am currently researching into real time languages and hope
>you ada experts can explain something to me. I apologise for
>my lack of knowledge in ada.
>When binding formal parameters with actual parameters the '=>'
>operator is used, irrespective of whether the formal parameter
>is declared as IN, INOUT or OUT. Is there a reason for this ?
>If I proposed an alternative syntax where "=>" indicated the FP
>was an IN parameter, "<=" to indicate an OUT parameter and "<=>"
>to indicate an INOUT.
>Then the caller of the procedure/function would have explicitly
>had to understand to direction of the parameters and at the same
>time increased the readability of his/her code.
>Is there a fundamental flaw in this line of thinking ?
>Does ada manage this problem via a different mechanism ?
The main flaw with your proposal is that <= already has a meaning
(less than or equal). Other than that, though, I think it would have
been a good idea.
I seem to remember that an early definition of Ada, while the language
definition was still in the works, used := for IN parameters, =: for
OUT (or was it vice versa?), and :=: for IN OUT. Does anyone else
remember this, or know why the idea was scrapped?
-- Adam
next prev parent reply other threads:[~1995-03-16 19:20 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
1995-03-11 10:12 Syntax question Geoffrey Hollingworth
1995-03-11 15:16 ` Robert A Duff
1995-03-11 20:45 ` Michael Feldman
1995-03-15 23:29 ` David Kusuda
1995-03-16 2:25 ` David Weller
1995-03-16 14:44 ` Spencer Allain
1995-03-19 1:04 ` Robert Dewar
1995-03-16 9:19 ` Fred J. McCall
1995-03-17 5:44 ` Niklas Holsti
1995-03-19 20:53 ` Robert Dewar
1995-03-11 21:44 ` Road Pilot
1995-03-23 13:07 ` Bob Collins
1995-03-24 1:11 ` Kevin F. Quinn
1995-03-27 14:19 ` Norman H. Cohen
1995-03-13 4:43 ` Keith Thompson
1995-03-16 20:37 ` Norman H. Cohen
1995-03-21 0:51 ` Robert Dewar
1995-03-16 19:20 ` Adam Beneschan [this message]
-- strict thread matches above, loose matches on Subject: below --
2001-07-05 17:58 Syntax Question Robby Simpson
2001-07-05 18:32 ` Marin David Condic
2001-07-05 18:38 ` Robby Simpson
2001-07-05 19:09 ` Ted Dennison
2001-07-05 20:14 ` Robby Simpson
2001-07-05 21:44 ` Robert Dewar
2001-07-09 12:39 ` Robby Simpson
[not found] <Cx6pG3.IEp@ucc.su.oz.au>
1994-10-05 14:20 ` Syntax question Tucker Taft
[not found] ` <36ui0u$4dg@gnat.cs.nyu.edu>
1994-10-06 0:04 ` David Weller
1994-10-05 5:19 Adrian Cho
1994-10-05 11:52 ` Robert Dewar
1994-10-05 17:19 ` Norman H. Cohen
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