So CFBridgingRelease() essentially calls -autorelease, and CFBridgingRetain() -retain? I kind of get why, but only after thinking about it for an hour.
On Tue, Aug 22, 2017 at 12:56 PM, Fred Kiefer <fredkie...@gmx.de> wrote: > > > Am 22.08.2017 um 17:15 schrieb Stefan Bidigaray <stefanb...@gmail.com>: > > > > Hi everyone, > > This message is mostly for Daniel, but anyone with some experience using > these functions should not hesitate to add their thoughts. > > > > Daniel, I just noticed your pull request on github last night. I'm good > with most of it, my only concern is the bridging functions. I made a > comment last night, but later discovered I misunderstood their purpose. I'd > like to get your pull request merged, and want do discuss it before we move > forward. > > > > My understanding of the documentation for CFBridgingRelease and > CFBridgingRetain is that they are essentially no-ops, unless ARC is in > effect. And even when ARC is being used they do not do anything other than > tell the compiler that the object is now controlled by ARC. With that in > mind, these two "functions" should do nothing other than cast the CF object > as an ARC aware object, and nothing at all if ARC is not implemented. Does > this sound reasonable? Another part of this conversation is where do these > functions belong. According to the Apple documentation, they are part of > Foundation, so should they not be in Base, instead? > > > > As for CFAutorelease, I think this is the function where > objc_autoreleaseReturnValue() needs to be used. The documentation for this > function is nonexistent, so I'm just guessing at what it really does. > > > > Any thoughts? Anyone? > > > Stefan, > > I think you are mostly correct. Apple has this stuff in Foundation, but we > don’t build base on top of CoreFoundation, so we need to have it the other > way around. In ARC-mode these two functions should call the compiler > primitives David pointed to. Where you are incorrect is the non-ARC-mode. > There Apple seems to implement these functions as retain and > (auto-)release. Don’t ask me why, your interpretations makes more sense to > me. > > Fred > > > > _______________________________________________ > Gnustep-dev mailing list > Gnustep-dev@gnu.org > https://lists.gnu.org/mailman/listinfo/gnustep-dev >
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