Re: pointer in C & in Ada

["Des Walker" <des.walker@dessy.fsnet.co.uk>]

Ted Dennison <dennison@telepath.com> wrote in message
news:otcc7.2752$NJ6.10767@www.newsranger.com...
> In article <86772402.0108071439.1c3e1e40@posting.google.com>, Lin
says...
> >
> >If "int *p" declares that pointer p points to integer type, then
> >what's the meaning of "void *p"? How can I represent it(void *p) in
> >Ada language?
>
>
> I generally use System.Address (or a private type derived from it).
There was a
> long discussion about this a few years back. What I remember was that
this is
> not guaranteed to be portable (to work on every platform), but no-one
could
> think of an existing platform on which it doesn't work. If an access
to
> Interfaces.C.Char seems more portable, use that.
>
> ---
> T.E.D.    homepage   - http://www.telepath.com/dennison/Ted/TED.html
>           home email - mailto:dennison@telepath.com

Hi,

I didn't read the aforementioned thread, so apologies if this is old
information. Just for interest on interfacing to C functions, I note
that the C-FAQ mentions some platforms that use different addressing
mechanisms depending on the type of object being addressed, in a
discussion about the null pointer in C.

http://www.eskimo.com/~scs/C-faq/q5.17.html

There probably isn't an Ada port for most of these platforms, although
the 8086 family gets a mention, as some may use 16 bit data pointers and
32 bit function pointers.

    Regards
    Des Walker