@class NSMutableArray, NSObject; @protocol OS_dispatch_queue; @interface AVCaptureDeviceControlRequestQueue : NSObject { NSObject<OS_dispatch_queue> *_serialQueue; NSMutableArray *_mutableArray; } - (id)head; - (id)init; - (id)dequeue; - (void)dealloc; - (void)enqueueRequest:(id)a0; @end