Type Alias GEcallback

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

None

No value.

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

Some value of type T.