Type Alias HidStateCallback 

pub type HidStateCallback = Option<unsafe extern "C" fn(state: bool, context: *mut c_void)>;

Aliased Type

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

Variants

None

No value.

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

Some value of type T.