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class AsyncOperation: Operation {
var completion: () -> Void
init(completion: @escaping () -> Void) {
self.completion = completion
}
override func main() {
let waitForFinish = DispatchGroup()
waitForFinish.enter()
if isCancelled { waitForFinish.leave(); return }
CoolAsyncFunction {
waitForFinish.leave()
}
waitForFinish.wait()
completion()
if self.isCancelled { return }
}
}
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