From: john.mccabe@emrad.ns.com (John McCabe)
Subject: Re: Out parameters in a function
Date: Mon, 15 Apr 2002 10:49:04 GMT
Date: 2002-04-15T10:49:04+00:00 [thread overview]
Message-ID: <3cbaafd0.10365294@news.demon.co.uk> (raw)
In-Reply-To: a9chqr$23e76$1@ID-107015.news.dfncis.de
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On Sun, 14 Apr 2002 20:29:10 +0200, "Nazgul"
<darkelf@aim.homelinux.com> wrote:
You could use a procedure, or you could use a function that returns a
record containing a boolean and the character you want.
As far as I can remember, a way of getting round the no-side-effects
feature of functions is to pass it a pointer then update the contents
of the pointed to location.
>Hi, I need to use an output parameter in an Ada function, something like
>
>function ReadChar(f: File; c: out character) return boolean;
>
>The function must return a boolean, so the only way to read the character is
>via the 'c' parameter. In other context, I use
>
>function (something: tpSomething) return ...; where tpSomething is an access
>to a record type, and I can modify the contents of the record in the
>function, but if I use
>
>function ReadChar(f: File; c: access character) return boolean;
>
>the compiler gives an error when i do something like
>
>c:=anything;
>
>Is there any way of using c as an output parameter?
>
>Thanks.
>
>--
>
> (:==================:)
> �lvaro Iradier
> airadier@able.es
> (+34)660133259
> (:==================:)
>
>
next prev parent reply other threads:[~2002-04-15 10:49 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-04-14 18:29 Out parameters in a function Nazgul
2002-04-14 19:45 ` David C. Hoos, Sr.
2002-04-15 10:49 ` John McCabe [this message]
2002-04-15 11:51 ` John McCabe
2002-04-15 13:43 ` Steve Doiel
2002-04-15 15:09 ` Ted Dennison
2002-04-16 8:49 ` John McCabe
2002-04-16 10:05 ` Dmitry A. Kazakov
2002-04-16 15:26 ` John McCabe
2002-04-16 19:34 ` Matthew Woodcraft
2002-04-16 20:10 ` Darren New
2002-04-17 1:30 ` Kent Paul Dolan
2002-04-17 16:15 ` Darren New
2002-04-19 17:39 ` Florian Weimer
2002-04-17 13:24 ` Stephen Leake
2002-04-17 16:32 ` Darren New
2002-04-17 21:03 ` Kent Paul Dolan
2002-04-18 12:14 ` Wolfgang Gellerich
2002-04-18 13:52 ` Dmitry A. Kazakov
2002-04-18 16:28 ` Darren New
2002-04-17 10:17 ` John McCabe
2002-04-16 19:58 ` Kent Paul Dolan
2002-04-16 20:00 ` Kent Paul Dolan
2002-04-17 4:40 ` Jim Rogers
2002-04-17 5:27 ` Kent Paul Dolan
2002-04-17 5:50 ` Eric G. Miller
2002-04-24 2:45 ` David Thompson
2002-04-19 17:40 ` Florian Weimer
2002-04-19 18:26 ` Jim Rogers
2002-04-19 18:53 ` Florian Weimer
2002-04-17 7:57 ` Dmitry A. Kazakov
2002-04-17 10:21 ` John McCabe
2002-04-24 17:21 ` Warren W. Gay VE3WWG
2002-04-26 7:32 ` Dmitry A. Kazakov
2002-04-15 16:24 ` Stephen Leake
2002-04-16 13:38 ` Ted Dennison
2002-04-17 11:55 ` Ingo Marks
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