Type Alias SPNOTIFYCALLBACK 

pub type SPNOTIFYCALLBACK = Option<unsafe extern "system" fn(wparam: WPARAM, lparam: LPARAM)>;

Aliased Type

pub enum SPNOTIFYCALLBACK {
    None,
    Some(unsafe extern "system" fn(WPARAM, LPARAM)),
}

Variants

None

No value.

Some(unsafe extern "system" fn(WPARAM, LPARAM))

Some value of type T.