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From: "Steve Doiel" <nospam_steved94@attbi.com>
Newsgroups: comp.lang.ada
References: <a9chqr$23e76$1@ID-107015.news.dfncis.de>
Subject: Re: Out parameters in a function
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"Nazgul" <darkelf@aim.homelinux.com> wrote in message
news:a9chqr$23e76$1@ID-107015.news.dfncis.de...
> Hi, I need to use an output parameter in an Ada function, something like
>
> function ReadChar(f: File; c: out character) return boolean;
>

If you "need" this function because you're used to the C construct

  while ( (c=getchar()) != EOF )

May I suggest

  loop
    ReadChar( file, char, end_of_file );
    exit when end_of_file;
    ...
  end loop;

instead?

SteveD

> 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
>  (:==================:)
>
>