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What is toll-free bridging and when is it useful?

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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.

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