Type Alias TapCallback 

pub type TapCallback = Option<unsafe extern "C" fn(event_id: u32, data: *mut c_void)>;

Aliased Type

pub enum TapCallback {
    None,
    Some(unsafe extern "C" fn(u32, *mut c_void)),
}

Variants

None

No value.

Some(unsafe extern "C" fn(u32, *mut c_void))

Some value of type T.