Re: XForms: Global data

Ian Leonard (ian@eonsw.demon.co.uk)
Mon, 16 Mar 1998 11:54:00 +0000 (GMT)

# To subscribers of the xforms list from Ian Leonard <ian@eonsw.demon.co.uk> :

>From the keyboard of Jacques Tremblay comes:-
>
># To subscribers of the xforms list from Jacques Tremblay <jackt@gel.ulaval.ca> :
>
> Hi,
Hi,

First a small confession. I miss-read the orignal post and thought the
question applied to C++.

>
> This works on systems that have longs the same size as pointers.
>This has been discussed in the list some times ago. Suppose the pointers
>are 64 bits and the long 32 bits, it will crash. I think the best
>place to keep the this pointer is in the u_vdata structure element of
>the object because its a pointer. This makes code work on any system.
>I made an example of using XForms and C++. You can look at it in the
>Contrib directory of the xforms ftp.

True, but its a technical issue. The point is that you don't need to
pass around data stuctures with C++, you can direct the callback to the
relevent class.

BTW. What sort of machines have 64bit pointers and am I ever likely to
encounter one!

-- 
Ian


Ian Leonard                        eMail: ian@eonsw.demon.co.uk
                                   Phone Fax: +44 (0)1865 434757
                                   Fax: +44 (0)1865 434758
                                   19 Stapleton Road
                                   Headington, Oxford, OX3 7LX, UK 


Please ignore spelling and punctuation - I did.


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