Re: [Pyobjc-dev] Re: Making List<->Array bridging transparent

[Ronald O. <ous...@ci...>]

On Saturday, Nov 9, 2002, at 11:31 Europe/Amsterdam, Peter Montagner 
wrote:

> Bill Bumgarner wrote:
>
>>  ... is true, then we add <type 'list'> to the bases for the newly
>> created Python class object?   Assuming a complete implementation of
>> convenience methods, this would allow bridged instances of NSArray to
>> function fully on the Python side of the bridge [i.e. work in contexts
>> like the above where the runtime is testing for a particular type and
>> not just a set of methods].
>>
>> As an experiment, I tried-- naively-- to add this to the function that
>> bridges classes to Python... it doesn't work.
>
> So you can't do it by adding list as a base but could you instead just 
> not use ObjCObject to do the wrapping? What if you created another 
> class with list as the only base? You can't slam PyListObject and 
> ObjCObject together but could you subclass list and add real_object as 
> another variable? Or will python not even let you subclass compiled 
> classes in C?

That would work, but then NSArray would no longer by a subclass of 
NSObject. This will probably cause subtle bugs and won't buy us much in 
the long run. Especially because this will be a non-issue in Python 
2.3: I filed a bug-report related to this and the bug was fixed within 
a day :-)

Ronald