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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
References: <41E7F653.2F899F47@alfred-hilscher.de>
 <gemini.iad8lb0013zf002bc.nick.roberts@acm.org> <u651y3bfs.fsf@obry.net>
Subject: Re: Ada equivalent for C-pointer?
Date: Mon, 17 Jan 2005 15:38:41 -0600
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Date: 2005-01-17T15:38:41-06:00
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"Pascal Obry" <pascal@obry.net> wrote in message
news:u651y3bfs.fsf@obry.net...
>
> Nick Roberts <nick.roberts@acm.org> writes:
>
> > For example, if there is a C function defined thus:
> >
> >    int wibble(int *n);
> >
> > then in Ada you can declare:
> >
> >    function Wibble (Number: in out Interfaces.C.int);
> >    pragma Import(C,Wibble,"wibble");
> >
> > and it should work. (Obviously, you must link the C functions in
somehow.)
>
> I don't think so. Here Number will be passed by value, no? And you also
need
> the returned value ;)

Go re-read B.3(63-71). In this case, specifically B.3(68). Now, that is only
"advice", but compilers are strongly encouraged to follow "advice", and I
think that they all do in this area. (Otherwise, Claw wouldn't have been
possible - we use the same pragma Imports for all of the compilers.)

                         Randy.