# Function nom::number::complete::double

source · [−]

    pub fn double<T, E: ParseError<T>>(input: T) -> IResult<T, f64, E> where
        T: Slice<RangeFrom<usize>> + Slice<RangeTo<usize>> + Slice<Range<usize>>,
        T: Clone + Offset + ParseTo<f64> + Compare<&'static str>,
        T: InputIter + InputLength + InputTake,
        <T as InputIter>::Item: AsChar + Copy,
        <T as InputIter>::IterElem: Clone,
        T: InputTakeAtPosition,
        <T as InputTakeAtPosition>::Item: AsChar,
        T: AsBytes,
        T: for<'a> Compare<&'a [u8]>,

Expand description

Recognizes floating point number in text format and returns a f64.

Complete version: Can parse until the end of input.

    use nom::number::complete::double;

    let parser = |s| {
      double(s)
    };

    assert_eq!(parser("11e-1"), Ok(("", 1.1)));
    assert_eq!(parser("123E-02"), Ok(("", 1.23)));
    assert_eq!(parser("123K-01"), Ok(("K-01", 123.0)));
    assert_eq!(parser("abc"), Err(Err::Error(("abc", ErrorKind::Float))));