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From: john.mccabe@emrad.ns.com (John McCabe)
Newsgroups: comp.lang.ada
Subject: Re: Out parameters in a function
Date: Mon, 15 Apr 2002 10:49:04 GMT
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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
> (:==================:)
>
>