Function atoi::ascii_to_digit

pub fn ascii_to_digit<I>(character: u8) -> Option<I>
where
    I: Zero + One,

Converts an ascii character to digit

Example

use atoi::ascii_to_digit;
assert_eq!(Some(5), ascii_to_digit(b'5'));
assert_eq!(None, ascii_to_digit::<u32>(b'x'));