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| class SwitchToLatest { | |
| var latest: Cancelable? | |
| func switchTo(next: Cancelable) { | |
| if let latest = self.latest { | |
| latest.cancel() | |
| } | |
| latest = next | |
| } | |
| deinit { | |
| latest?.cancel() | |
| } | |
| } |
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