[Pyobjc-dev] posing

[<bb...@ma...>]

I committed a test case that tests if poseAsClass: allows a Python 
implemented subclass of an Objective-C object to pose as the 
Objective-C superclass.

It currently doesn't because Python based subclasses of Objective-C 
classes *always* add at least one instance variable.  Causes a fatal 
error.

Specifically (from class-builder.m):

/* We add 1 instance variable to hybrid objective-C/Python classes, this
  * contains the reference to the python half of the class. Name should 
be
  * not be used by Objective-C classes that are not managed by PyObjC...
  */
static char pyobj_ivar[] = "__pyobjc_obj__";

I'm going to try modifying the way this all works a bit.  Specifically:

     - add the method +(BOOL)__pyobjc__hasPythonImplementation to 
NSObject;  returns NO.

     - add the same method to all "mixed" classes as the class is 
created in class-builder.m  It will return YES.

     - eliminate pyobj_ivar from class-builder.m entirely

End result;  no additional ivar in Python subclasses of ObjC classes.   
This *should* be enough to make posing work.   It will likely also be a 
step in the right direction for categories.

b.bum