Dietmar Planitzer:
> Greg Hurrell:
>> Dietmar Planitzer:
>>>
>>> There are a ton of highly interesting things there. I like all of
>>> them - but my personal favorit is the AGC stuff.
>>
>> Could you comment a bit more about that? What are some of the highly
>> interesting things in there. I've looked at the CVS repository but I
>> don't know enough to really interpret what's in there that's going to
>> benefit me; from my perspective as an Objective-C user (not a compiler
>> hacker).
>
> Jason has already listed some of those features (method attributes, agc,
> properties). Now a disclaimer, before we go further:
Subject to the same disclaimers, I note:
* Properties: properties may be writeable or read-only, and copying or
non-copying.
It seems as though they can be based on custom getter and setter
methods, or on auto-generated setter and getter methods for an
existing ivar, or have both ivar and methods generated by the
compiler.
* Runtime structures such as objc_class and the method dispatch table
will change.
* There is something about "indirect references" through which ivars
cannot be accessed directly.
* A warning that "type-cast of @selector expression won't be supported
in future" (so if you're treating SELs as strings, start using
sel_getName() or NSStringFromSelector()).
* Protocol methods may be @required or @optional.
* That metaclass stuff. What's a metaclass?
* A foreach() construct, as Dietmar mentioned. This appears to work
directly with the collection being iterated over rather than using
an intermediate NSEnumerator. It also fetches sixteen elements at
a time to reduce message calls.
--
Jens Ayton
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