# Function nom::number::streaming::f64

source · [−]

    pub fn f64<I, E: ParseError<I>>(
        endian: Endianness
    ) -> fn(_: I) -> IResult<I, f64, E> where
        I: Slice<RangeFrom<usize>> + InputIter<Item = u8> + InputLength,

Expand description

Recognizes an 8 byte floating point number

If the parameter is `nom::number::Endianness::Big`, parse a big endian f64 float, otherwise if `nom::number::Endianness::Little` parse a little endian f64 float. Streaming version: Will return `Err(nom::Err::Incomplete(_))` if there is not enough data.

    use nom::number::streaming::f64;

    let be_f64 = |s| {
      f64::<_, (_, ErrorKind)>(nom::number::Endianness::Big)(s)
    };

    assert_eq!(be_f64(&[0x40, 0x29, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00][..]), Ok((&b""[..], 12.5)));
    assert_eq!(be_f64(&b"abc"[..]), Err(Err::Incomplete(Needed::new(5))));

    let le_f64 = |s| {
      f64::<_, (_, ErrorKind)>(nom::number::Endianness::Little)(s)
    };

    assert_eq!(le_f64(&[0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x29, 0x40][..]), Ok((&b""[..], 12.5)));
    assert_eq!(le_f64(&b"abc"[..]), Err(Err::Incomplete(Needed::new(5))));