@class SSPromise, NSObject; @protocol OS_dispatch_queue; @interface SSUniqueExecutionQueue : NSObject @property (copy, nonatomic) id /* block */ block; @property (retain, nonatomic) NSObject<OS_dispatch_queue> *callBlockQueue; @property (retain, nonatomic) NSObject<OS_dispatch_queue> *executeBlockQueue; @property (retain, nonatomic) SSPromise *promise; @property (readonly, nonatomic) NSObject<OS_dispatch_queue> *promiseAccessQueue; - (id)initWithBlock:(id /* block */)a0; - (void)addCompletionBlock:(id /* block */)a0; - (void).cxx_destruct; @end