Takes a collection of binary data and creates a hex string from it.

hex_string a collection

template <typename STD_COLLECTION>
std::string as_hex_string(STD_COLLECTION&& collection) {
    std::stringstream ss;

    for (unsigned char c: std::forward<STD_COLLECTION>(collection))
        ss << std::setfill('0') << std::setw(2) << std::hex << static_cast<short>(c) << " ";

    return ss.str();
}