Function hakuban::ffi::hakuban_object_observe_changes_callback_register

#[no_mangle]
pub extern "C" fn hakuban_object_observe_changes_callback_register(
    object_observe_ptr: *mut ObjectObserve<ObjectRawData, ()>, 
    callback: ObjectEventCallbackFn, 
    userdata: *const c_void
) -> *mut Box<dyn Callback<Event<ObjectDescriptor>>>