pub type ViHndlr = Option<unsafe extern "system" fn(vi: ViSession, eventType: ViEventType, event: ViEvent, userHandle: ViAddr) -> ViStatus>;Aliased Type§
pub enum ViHndlr {
None,
Some(unsafe extern "system" fn(u64, u64, u64, *mut c_void) -> i64),
}