gistfile1.txt

        // utf16 escape
    do_str4:
        if(BOOST_JSON_LIKELY(
            cs.remain() >= 4))
        {
            char d;
            d = hex_digit(*cs);
            if(d == -1)
            {
                ec_ = error::expected_hex_digit;
                return;
            }
            u_ = d << 12;
            ++cs;
            d = hex_digit(*cs);
            if(d == -1)
            {
                ec_ = error::expected_hex_digit;
                return;
            }
            u_ |= d << 8;
            ++cs;
            d = hex_digit(*cs);
            if(d == -1)
            {
                ec_ = error::expected_hex_digit;
                return;
            }
            u_ |= d << 4;
            ++cs;
            d = hex_digit(*cs);
            if(d == -1)
            {
                ec_ = error::expected_hex_digit;
                return;
            }
            u_ |= d;
            ++cs;