#import <Foundation/Foundation.h> NS_ASSUME_NONNULL_BEGIN /* * This class holds a set of weak pointers to 'listener' objects, and offers the chance to dispatch updates * to them on each listener's own serial dispatch queue */ @interface CKKSListenerCollection<__covariant ListenerType> : NSObject - (instancetype)init NS_UNAVAILABLE; - (instancetype)initWithName:(NSString*)name; - (void)registerListener:(ListenerType)listener; - (void)iterateListeners:(void (^)(ListenerType))block; @end NS_ASSUME_NONNULL_END