At 7:48 AM -0700 6/8/08, Shawn Erickson wrote:
Likely best to point folks at the documentation...
<http://developer.apple.com/documentation/Cocoa/Conceptual/GarbageCollection/Articles/gcCoreFoundation.html>
Yes, that is quite helpful (except that the imagined implementation
of CFMakeCollectable omits the fact that it is a no-op in managed
memory mode).
This email sent to [EMAIL PROTECTED] 2:26 PM +0200 6/8/08,
Jean-Daniel Dupas wrote:
If I'm not wrong, it should be something like this:
[NSMakeCollectable(aCGImageRef) autorelease];
This appears correct, except for the fact that, for reasons known
only to Apple, although CFMakeCollectable is available in 10.4, the
trivial NSMakeCollectable macro is available only in 10.5. So
expanding the NSMakeCollectable macro gives:
return [(id)CFMakeCollectable(aCGImageRef) autorelease];
However, the working of this line of code is rather subtle.
In memory managed mode CFMakeCollectable is a no-op and autorelease
works, so the code is equivalent to
return [(id)aCGImageRef autorelease];
while in garbage collected mode, CFMakeCollectable is equivalent to
CFRelease, and autorelease is a no-op, so the code is equivalent to:
CFRelease(aCGImageRef);
return (id)aCGImageRef
The documentation is well worth readings because it is quite tricky
the way CFRetain/CFRelease always work, even in garbage collection
mode, and CFRetainCount > 0 stops garbage collection from happening
on the object, while retain/release/autorelease work only in memory
managed mode and are no-ops in garbage collection mode (that part is
well known I think).
Thanks for the enlightenment!
Peter.
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