# i128 in nom::number::complete - Rust
Recognizes a signed 16 byte integer
Keywords: rust, rustlang, rust-lang, i128

# Function nom::number::complete::i128

source · [−]

    pub fn i128<I, E: ParseError<I>>(
        endian: Endianness
    ) -> fn(_: I) -> IResult<I, i128, E> where
        I: Slice<RangeFrom<usize>> + InputIter<Item = u8> + InputLength,

Expand description

Recognizes a signed 16 byte integer

If the parameter is `nom::number::Endianness::Big`, parse a big endian i128 integer, otherwise if `nom::number::Endianness::Little` parse a little endian i128 integer. complete version: returns an error if there is not enough input data

    use nom::number::complete::i128;

    let be_i128 = |s| {
      i128(nom::number::Endianness::Big)(s)
    };

    assert_eq!(be_i128(&b"\x00\x01\x02\x03\x04\x05\x06\x07\x00\x01\x02\x03\x04\x05\x06\x07abcefg"[..]), Ok((&b"abcefg"[..], 0x00010203040506070001020304050607)));
    assert_eq!(be_i128(&b"\x01"[..]), Err(Err::Error((&[0x01][..], ErrorKind::Eof))));

    let le_i128 = |s| {
      i128(nom::number::Endianness::Little)(s)
    };

    assert_eq!(le_i128(&b"\x00\x01\x02\x03\x04\x05\x06\x07\x00\x01\x02\x03\x04\x05\x06\x07abcefg"[..]), Ok((&b"abcefg"[..], 0x07060504030201000706050403020100)));
    assert_eq!(le_i128(&b"\x01"[..]), Err(Err::Error((&[0x01][..], ErrorKind::Eof))));