Type Alias fmExprContextCallbackFunction

pub type fmExprContextCallbackFunction = Option<unsafe extern "C" fn(arg: Datum)>;

Aliased Type

enum fmExprContextCallbackFunction {
    None,
    Some(unsafe extern "C" fn(_: Datum)),
}

Variants

None

No value.

Some(unsafe extern "C" fn(_: Datum))

Some value of type T.