Type Alias Opt 

pub type Opt<P = u32, O = Operand, S = u32> = Option<Datum<P, O, S>>;

An option that may be absent.

Aliased Type

pub enum Opt<P = u32, O = Operand, S = u32> {
    None,
    Some(Datum<P, O, S>),
}

Variants

None

No value.

Some(Datum<P, O, S>)

Some value of type T.