Type Alias GEcallback

Source
pub type GEcallback = Option<unsafe extern "C" fn(GEevent, *mut _GEDevDesc, *mut SEXPREC) -> *mut SEXPREC>;

Aliased Type§

enum GEcallback {
    None,
    Some(unsafe extern "C" fn(GEevent, *mut _GEDevDesc, *mut SEXPREC) -> *mut SEXPREC),
}

Variants§

§1.0.0

None

No value.

§1.0.0

Some(unsafe extern "C" fn(GEevent, *mut _GEDevDesc, *mut SEXPREC) -> *mut SEXPREC)

Some value of type T.