[Pyobjc-dev] Re: [Pyobjc-checkins] [PyObjC-svn] r1708 - in branches/selector-cleanup: . Lib/objc/test Modules/objc

[Ronald O. <ron...@ma...>]

On 26-jun-2005, at 1:52, Bob Ippolito wrote:

>
> On Jun 25, 2005, at 6:28 PM, ron...@re... wrote:
>
>
>> Author: ronaldoussoren
>> Date: Sat Jun 25 17:28:03 2005
>> New Revision: 1708
>>
>> Modified:
>>    branches/selector-cleanup/Lib/objc/test/test_subclass.py
>>    branches/selector-cleanup/Modules/objc/objc-class.m
>>    branches/selector-cleanup/NEWS.txt
>> Log:
>> - staticmethods are moved into the meta class to get the right  
>> behaviour
>>   [XXX: not 100% sure if this the correct, staticmethods are now  
>> no longer
>>   accessible through instances]
>> - found an incompatibility: calls to super() in class methods  
>> should be
>>   changed in user code because class methods are now normal  
>> methods in
>>   the meta class.
>>
>
> Would this work?
>
> def alloc(cls):
>     return super(cls, cls).alloc()

No, for several reasons. First of all the first argument to super  
must be a constant, otherwise method chaining won't work. This is  
true for pure python code as wel.

Secondly for normal methods the first argument must be the type of  
the second argument (that is ``isinstance(arg2, arg1)``). Things are  
different for ``classmethod`` instances, which is why the interface  
has changed: class methods used to be simular to ``classmethod``  
instances but are now normal methods on the meta class.

BTW. I don't think this a problem, I seldomly use class methods  
outside of the PyObjC unittests.

Ronald