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From: "M. A. Alves" <maa@liacc.up.pt>
Newsgroups: comp.lang.ada
Subject: Re: Ada Address = C pointer ?
Date: Tue, 30 Oct 2001 10:30:30 +0000 (GMT)
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Date: 2001-10-30T10:30:30+00:00

On Mon, 29 Oct 2001 tmoran@acm.org wrote:
> >very surprised if System.Address had a different representation from char*
> >or void*.
>   Hold onto your hat!  The program
> with system;
> with ada.text_io;
> procedure junk is
>   x : integer;
>   a : constant system.address := x'address;
>   package sio is new ada.text_io.integer_io(system.word);
>   package oio is new ada.text_io.integer_io(system.offset_type);
> begin
>   sio.put(a.segment, base=>16);
>   oio.put(a.offset, base=>16);
>   ada.text_io.new_line;
> end junk;
> compiles (Janus compiler) and runs, producing
> 16#157# 16#60FCD4#
> on the Windows 95 system I'm posting from.

Interesting. The code is incompatible with GNAT.

The original issue in this thread is the set of equivalences:

Ada                C
--------------------
Address       * void
Address       * char
Null_Address    NULL

GNAT seems to honor these equivalences.  Does Janus?

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