pub type CFRunLoopObserverCallBack = Option<unsafe extern "C" fn(observer: CFRunLoopObserverRef, activity: CFRunLoopActivity, info: *mut c_void)>;Aliased Type§
pub enum CFRunLoopObserverCallBack {
None,
Some(unsafe extern "C" fn(*mut __CFRunLoopObserver, u64, *mut c_void)),
}