Function lip::optional_with_default

source ·

pub fn optional_with_default<'a, A: Clone + 'a, P, S: Clone + 'a>(
    default: A,
    parser: P
) -> impl Parser<'a, Output = A, State = S>where
    P: Parser<'a, Output = A, State = S> + 'a,

Expand description

Optionally parse something. Returns supplied default value if parse failed.