Function lexical::parse_partial_with_options

pub fn parse_partial_with_options<N: FromLexicalWithOptions, Bytes: AsRef<[u8]>, const FORMAT: u128>(
    bytes: Bytes,
    options: &N::Options,
) -> Result<(N, usize)>

High-level, partial conversion of bytes to a number with custom parsing options.

This functions parses as many digits as possible, returning the parsed value and the number of digits processed if at least one character is processed. If another error, such as numerical overflow or underflow occurs, this function returns the error code and the index at which the error occurred.

• FORMAT - Packed struct containing the number format.
• bytes - Byte slice to convert to number.
• options - Options to specify number parsing.

Panics

If the provided FORMAT is not valid, the function may panic. Please ensure is_valid() is called prior to using the format, or checking its validity using a static assertion.

Examples

const FORMAT: u128 = lexical::format::STANDARD;
let options = lexical::ParseFloatOptions::builder()
    .exponent(b'^')
    .decimal_point(b',')
    .build()
    .unwrap();
assert_eq!(lexical::parse_partial_with_options::<f32, _, FORMAT>("0", &options), Ok((0.0, 1)));
assert_eq!(lexical::parse_partial_with_options::<f32, _, FORMAT>("1,2345", &options), Ok((1.2345, 6)));
assert_eq!(lexical::parse_partial_with_options::<f32, _, FORMAT>("1,2345^4", &options), Ok((12345.0, 8)));