On 5/14/07, Collin Winter <[EMAIL PROTECTED]> wrote: > There really is no difference between roles and [EMAIL PROTECTED] > ABCs. From my point of view, though, roles win because they don't > require any changes to the interpreter; they're a much simpler way of > expressing the same concept.
Ok, you clearly have an implementation in mind, but I don't know what it is. As far as I can tell: * metaclass=Role ~ metaclass=ABCMeta, except that all methods must be abstract * perform_role(role)(cls) ~ role.register(cls) * performs(obj, role) ~ isinstance(obj, role) And so, as far as I can see, without an Implementation section, all you're propsing is a different syntax for the same functionality. Was there a discussion of your implementation that I missed? > You may like adding the extra complexity > and indirection to the VM necessary to support > issubclass()/isinstance() overriding, but I don't. Have you looked at Guido's issubclass()/isinstance() patch (http://bugs.python.org/1708353)? I'd hardly say that 34 lines of C code is substantial "extra complexity". STeVe -- I'm not *in*-sane. Indeed, I am so far *out* of sane that you appear a tiny blip on the distant coast of sanity. --- Bucky Katt, Get Fuzzy _______________________________________________ Python-3000 mailing list Python-3000@python.org http://mail.python.org/mailman/listinfo/python-3000 Unsubscribe: http://mail.python.org/mailman/options/python-3000/archive%40mail-archive.com
