Type Alias libR_sys::GEcallback

pub type GEcallback = Option<unsafe extern "C" fn(arg1: GEevent, arg2: *mut GEDevDesc, arg3: SEXP) -> SEXP>;

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.