Method add

rust/stringzilla.rs:346–348

(&mut self, c: char)

    /// This function assumes the character is in the ASCII range.
    #[inline]
    pub fn add(&mut self, c: char) {
        self.add_u8(c as u8);
    }

    /// Inverts the bit-set so that all set bits become unset and vice versa.
    #[inline]