CoCancellable
public protocol CoCancellable : AnyObjectUndocumented
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                  Cancels the current CoCancellable.DeclarationSwift func cancel()
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                  Adds an observer callback that is called when the CoCancellableis completed.DeclarationSwift func whenComplete(_ callback: @escaping () -> Void)ParameterscallbackThe callback that is called when the CoCancellableis completed.
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                  added(to:Extension method) 
 CoCancellable Protocol Reference
        CoCancellable Protocol Reference