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From: Nick Roberts <nick.roberts@acm.org>
Newsgroups: comp.lang.ada
Subject: Re: Ada equivalent for C-pointer?
Date: Sat, 15 Jan 2005 16:03:11 +0000
Message-ID: <gemini.iad8lb0013zf002bc.nick.roberts@acm.org>
References: <41E7F653.2F899F47@alfred-hilscher.de>
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Date: 2005-01-15T16:03:11+00:00
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Alfred Hilscher <SPAM@alfred-hilscher.de> wrote:

> I want to interface to a C-function expecting a "far *", what have I to
> pass: an "access all ..." or "System.Address"? Are there differences
> between access and address, or are their internal representations equal? I
> use GNAT 3.15p.

Assuming you are passing parameters to a C function, it should be very
simple.

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.)

If you were to give more information about what you are really trying to
achieve, we can probably give you more accurate and detailed answers.

-- 
Nick Roberts