@class NSObject; @protocol OS_dispatch_queue; @interface OperationState : NSObject @property (retain, nonatomic) NSObject<OS_dispatch_queue> *queue; @property BOOL operationCancelled; @property int operationRefcount; - (BOOL)begin; - (id)init; - (void)end; - (BOOL)cancelled; - (void).cxx_destruct; - (void)cancel; @end