El 07/08/2006, a las 22:09, Dietmar Planitzer escribió:
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)
While taking a quick glance at the diffs, this is what I see so far:
Line ~215: Real getters / setters (properties)
Line ~345: Method attributes (Woohoo!!!!!)
Line ~600: Weak references (Needed for GC)
Interesting things i found later on down in the sources...
it looks like getters and setters will be provided automatically if
not user specified. This leads me to think (along with references in
the code to a MetaClass object) that we may be getting true
reflection capabilities like java / .net have.
The guts of the objects have changed. I wonder if this could cause
link-time issues with older code? I don't know enough about compilers
in general to be sure though, so take that with a grain of salt.
More references to strong / weak refs. All signs point to a full-
blown GC, with an interesting comment in the code:
/* Return 1 if TYPE should be garbage collected, -1 if has __weak
attribute
and 0 otherwise. Types marked with the '__strong' attribute are
GC-able,
whereas those marked with __weak' are not. Types marked with
neither
attribute are GC-able if (a) they are Objective-C pointer types
or (b)
they are pointers to types that are themselves GC-able. */
So it appears (to me) that a full-blown GC which can collect any Obj-
C type is possible. I've read speculation that there would be a
separate pool type for GC objects, the last sentence of that comment
seems to confirm that -- being able to reference GC'able objects from
"standard" objects & vice-versa.
Now this is all speculation on my part from 10 minutes looking at the
source, YMMV... but if it's true, then Obj-C will become my hands-
down all-time favorite language -- All the Obj-C goodies we have
already, with all the best parts of java and .net, and it's still
compiled natively!! Wooooooooo!! :)
Jason
Cheers,
Greg
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