Function affinity_to_string

tests/BS_thread_pool_test.cpp:2983–2994

* @brief Convert a `std::vector ` representing CPU affinity to a string of 0s and 1s. * * @param affinity The affinity. * @return The string. */

 * @return The string.
 */
std::string affinity_to_string(const std::optional<std::vector<bool>>& affinity)
{
    if (affinity.has_value())
    {
        const std::size_t num_bits = affinity->size();
        std::string str(num_bits, ' ');
        for (std::size_t i = 0; i < num_bits; ++i)
            str[num_bits - i - 1] = (*affinity)[i] ? '1' : '0';
        return str;
    }
    return "N/A";
}

/**
 * @brief Check that getting and setting OS process affinity works.