Re: Summary: Where is object_setInstanceVariable() in GNUstep?

[Richard Frith-Macdonald]

On Saturday, November 30, 2002, at 05:55  pm, Andreas Hoeschler wrote:

> Hi all,
>
> I just found NSObjcRuntime.h and do
>
> #ifdef __APPLE__
>          (void)object_setInstanceVariable(controllerObject, [aspect 
> cString], targetCarrier);
> #else
>          (void)GSSetInstanceVariable(controllerObject, aspect, 
> targetCarrier);
> #endif
>
> now. Could not test if this works. At least the compiler does not 
> complain anymore.

I'm pretty sure that GSSetInstanceVariable() will have been marked as 
deprecated in whatever version of GNUstep you were looking at.
It does not exist in the current version in CVS,

What you want is the safer solution of using GSObjCFindVariable() and 
then GSObjCSetVariable() in the latest CVS code, since 
GSObjCFindVariable() provides type information you can use to ensure 
that you are not trying to set an incorrectly typed value into an 
instance variable.

These function are now present in GSObjCRuntime.m in the Additions 
subproject of the base library, where the idea is that people can port 
the Additions code to other systems (like Darwin) so a common set of 
additional facilities (including runtime functions) can be used on all 
systems.

You build a standalone 'additions'  library by doing a 'make add=yes' 
and can refrain from building the main base library (eg if you want to 
use apples Foundation) by using 'make add=yes base=no'

NB. nobody has actually ported this library yet ... so this is really 
just a nice idea to make portability easier in future /// though I'm 
happy to help out if anyone does port it, and to incorporate 
portability change into the GNUstep CVS for people.