Function nom::number::streaming::f64

source ยท 
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))));