Function double

pub fn double<T, E>() -> impl Parser<T, Output = f64, Error = E>
where
    E: ParseError<T>,
    T: Clone + Offset + Input + ParseTo<f64> + Compare<&'static str> + AsBytes + for<'a> Compare<&'a [u8]>,
    <T as Input>::Item: AsChar + Clone,

double precision floating point number parser from text