static CallbackHandler()
 {
     instanceEventCb = new InstanceEventCb(InstanceEventCbImpl);
     releaseEventCb  = new ReleaseEventCb(ReleaseEventCbImpl);
     releaseCb       = new ReleaseCb(ReleaseCbImpl);
 }
        private static extern IntPtr ManagedEventInstancer_Create(InstanceEventCb instanceEvent, ReleaseEventCb releaseEvent, ReleaseCb release
#if FULL_AOT_COMPILE
                                                                  , IntPtr instanceHandle
#endif
                                                                  );