Re: CoreBase toll-free bridging

[David Chisnall]

On 14 Mar 2013, at 20:19, Lars Sonchocky-Helldorf <address@hidden> wrote:

> 
> Am 14.03.2013 um 09:42 schrieb Fred Kiefer:
> 
>> Having decided that I googled once more and found this article:
>> http://www.mikeash.com/pyblog/friday-qa-2010-01-22-toll-free-bridging-internals.html
> 
> Interesting find in a comment there:
> 
> http://www.mikeash.com/pyblog/friday-qa-2010-01-22-toll-free-bridging-internals.html#comment-84b004a6a9b2e8b3a5fdec10f73b2393
> 
> "If you look at the Darwin sources, you'll see that the iPhone's 
> CoreFoundation classes are actually implemented in ObjC."
> 
> Is that true? If the code is accessible (I did a cursory search but found 
> nothing, just this: http://opensource.apple.com/source/CF/ but I can't tell 
> if there are iPhone versions amongst this) could we use it (given the license 
> is compatible).

If that were true, I'd expect CF_IS_OBJC() to return true for everything.  It 
has the same code path for DEPLOYMENT_TARGET_MACOSX and 
DEPLOYMENT_TARGET_EMBEDDED (which, I believe, means iOS), and so probably it is 
not the case.

That said, it would make sense, because iOS does not have a requirement be able 
to run Carbon code.  On the other hand, neither did 64-bit OS X.  Core 
Foundation is used by things like Launchd, and a variety of similar things on 
OS X (and iOS) that don't use any Objective-C code, so I'm not completely sure 
it is sensible.  

On the other hand, Apple decided to use COM for Quick Look, so sensible isn't 
necessarily a requirement...

David


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