Convert a string of binary into an ASCII string (C++)

Question

I have a string variable containing 32 bits of binary. What would be the best way to convert these 4 characters (8 bits is one character) represented by the binary back into the

Answer 1

here is my attempt:

std::string str2bits(const std::string_view &str, bool big_endian = false)
{
    std::string ret;
    ret.reserve(str.size() * 8);
    for (size_t i = 0; i < str.length(); ++i)
    {
        const uint8_t ord = uint8_t(str[i]);
        for (int bitnum = (big_endian ? 0 : 7);; (big_endian ? (++bitnum) : (--bitnum)))
        {
            if ((big_endian && bitnum >= 8) || (!big_endian && bitnum < 0))
            {
                break;
            }
            if (ord & (1 << bitnum))
            {
                ret += "1";
            }
            else
            {
                ret += "0";
            }
        }
    }
    return ret;
}

str2bits("test") ==> 01110100011001010111001101110100