Re: C Interface question

[David Kirkland <david@array.ca>]

Jerry van Dijk wrote:
> 
> Laurent Guerby (guerby@gnat.com) wrote:
> 
> : Jerry>        int *function(int value, int *result);
> 
> :    type int_star is access C.int;
> :    pragma Convention (C, Int_Star);
> 
> :    function F (Value : C.int; Result : int_star) return int_star;
> :    pragma Convention (C, F);
> 
> Of course, why do I always overlook the obvious ? This way I will never
> become rich and famous :-)
> 
> Thanks!
> --
> -----------------------------------------------------------------------
> --  Jerry van Dijk       --   e-mail: jerry@jvdsys.nextjk.stuyts.nl  --
> --  Banking Consultant   --              Member Team-Ada             --
> --  Ordina Finance BV    --    Located at Haarlem, The Netherlands   --

Hi all,
I have a similar question. I'm using an Ada83 compiler and have to
interface to a C function similar to the above except it contains
a pointer to a pointer ie.)

int *function(int value, int **result);

Now obviously I can use an access type to an access type, an extention
of what was posted earlier. My question is this - Is an access type
guaranteed to be equal to a C pointer? I know it is the most obvious
implementation but like so many things! Does the Ada LRM specify how
the access type is implemented?

Is there any advantage to using System.Address and then calling
the function with Type'Address ??