Re: "Toll free bridged" types
Re: "Toll free bridged" types
- Subject: Re: "Toll free bridged" types
- From: Bill Cheeseman <email@hidden>
- Date: Thu, 09 Jan 2003 04:56:16 -0500
on 03-01-08 9:25 PM, ryan at email@hidden wrote:
>
I'm investigating the "toll free bridged" types in CoreFoundation/Cocoa.
>
According to the documentation, certain types such as CFStringRef can be
>
casted to NSString * without any problem.
Yes. And the documentation is far from complete. For example, lots of
relatively simple types like NSNumber are toll-free bridged to their Core
Foundation counterparts.
>
The question is how far does this compatibility extend? From the
>
documentation I can surmise that the reference counting fields are the same
>
in NSObject and CFTypes. But how far does that compatibility extend? Is
>
the type systems similar?
All the way. In my experience, they are literally identical.
>
IE: If I do:
>
>
CFStringRef stringRef = CFStringCreate( ... ) ;
>
Id kindaString = (id) stringRef ;
>
>
Does 'kindaString' act like a NSString?
Yes. It even becomes autorelease-able, despite the fact that autorelease
isn't available outside Cocoa.
--
Bill Cheeseman - email@hidden
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