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`Publisher.assign(to:onWeak:)`.
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| import Combine | |
| extension Publisher where Failure == Never { | |
| func assign<Root: AnyObject>( | |
| to keyPath: ReferenceWritableKeyPath<Root, Output>, | |
| onWeak object: Root | |
| ) -> AnyCancellable { | |
| sink { [weak object] value in | |
| object?[keyPath: keyPath] = value | |
| } | |
| } | |
| } |
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