Tuesday, April 28, 2015 [Tweets] [Favorites]

Unmanaged

Nate Cook:

An Unmanaged<T> instance wraps a CoreFoundation type T, preserving a reference to the underlying object as long as the Unmanaged instance itself is in scope. There are two ways to get a Swift-managed value out of an Unmanaged instance:

  • takeRetainedValue(): returns a Swift-managed reference to the wrapped instance, decrementing the reference count while doing so—use with the return value of a Create Rule function.

  • takeUnretainedValue(): returns a Swift-managed reference to the wrapped instance without decrementing the reference count—use with the return value of a Get Rule function.

In practice, you’re better off not even working with Unmanaged instances directly. Instead, take... the underlying instance immediately from the function’s return value and bind that.

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