# Function nom::number::complete::i64

source · [−]

    pub fn i64<I, E: ParseError<I>>(
        endian: Endianness
    ) -> fn(_: I) -> IResult<I, i64, E> where
        I: Slice<RangeFrom<usize>> + InputIter<Item = u8> + InputLength,

Expand description

Recognizes a signed 8 byte integer

If the parameter is `nom::number::Endianness::Big`, parse a big endian i64 integer, otherwise if `nom::number::Endianness::Little` parse a little endian i64 integer. complete version: returns an error if there is not enough input data

    use nom::number::complete::i64;

    let be_i64 = |s| {
      i64(nom::number::Endianness::Big)(s)
    };

    assert_eq!(be_i64(&b"\x00\x01\x02\x03\x04\x05\x06\x07abcefg"[..]), Ok((&b"abcefg"[..], 0x0001020304050607)));
    assert_eq!(be_i64(&b"\x01"[..]), Err(Err::Error((&[0x01][..], ErrorKind::Eof))));

    let le_i64 = |s| {
      i64(nom::number::Endianness::Little)(s)
    };

    assert_eq!(le_i64(&b"\x00\x01\x02\x03\x04\x05\x06\x07abcefg"[..]), Ok((&b"abcefg"[..], 0x0706050403020100)));
    assert_eq!(le_i64(&b"\x01"[..]), Err(Err::Error((&[0x01][..], ErrorKind::Eof))));