@class NSPredicate, NSMutableDictionary, NSObject; @protocol OS_dispatch_queue; @interface COStateObserver : NSObject @property (readonly, nonatomic) NSObject<OS_dispatch_queue> *dispatchQueue; @property (readonly, copy, nonatomic) id /* block */ block; @property (readonly, retain, nonatomic) NSPredicate *predicate; @property (readonly, copy, nonatomic) NSMutableDictionary *lastChanges; - (id)description; - (void).cxx_destruct; - (void)notify:(id)a0; - (id)initWithDispatchQueue:(id)a0 predicate:(id)a1 block:(id /* block */)a2; @end