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As a newcomer to iPhone development and Objective-C in general over the last few weeks I have come across numerous mentions of 'Toll free bridges' between CF and NS frameworks.
One particular example would be CFStream and NSStream.
Does a resource exists documenting all of these bridges and how to use them ? Is it just as simple as casting from an object of one type to another ?
I ask as at the moment I am using NSStream calls that are not stricly allowed within the iPhone SDK and understand that I should be using CFStream calls.
EDIT: A useful article about how TFB works
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Currently the bridge transports about 140,000 motorists, 92,000 transit riders, 600 bikers and 500 pedestrians between the two boroughs. The bridge is toll free.
The Manhattan Bridge is a suspension bridge that crosses the East River connecting Lower Manhattan at Canal Street with Downtown Brooklyn at the Flatbush Avenue Extension. It is a toll-free bridge.
Toll-free bridging means that the data structures are interchangeable. It is just as simple as casting — that's the "toll-free" part. Anyplace you can use the type on one side of the bridge, you can use the other. So, for example, you can create a CFString and then send NSString messages to it, or you can create an NSArray and pass the array to CFArray functions.
Apple keeps a list of the supported toll-free bridged types on its site.
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