@interface _REAudioManagerCancellable : NSObject {
    struct atomic<bool> { struct __cxx_atomic_impl<bool, std::__cxx_atomic_base_impl<bool>> { _Atomic BOOL __a_value; } __a_; } _cancelled;
}

@property (readonly, getter=isCancelled) BOOL cancelled;

- (id)init;
- (void)cancel;

@end