Add numbers

BigNum add_numbers(BigNum num1, BigNum num2)
{
    BigNum result{};

    if (num1.base == num2.base)
    {
        result.base = num1.base;
    }
    else
    {
        return result;
    }

    auto it1 = num1.number.rbegin();
    auto it2 = num2.number.rbegin();

    uint64_t carry = 0;

    while (it1 != num1.number.rend() || it2 != num2.number.rend())
    {
        uint64_t n1 = (it1 != num1.number.rend()) ? *it1++ : 0;
        uint64_t n2 = (it2 != num2.number.rend()) ? *it2++ : 0;

        uint64_t temp = n1 + n2 + carry;
        carry = 0;

        if (temp > num1.base - 1)
        {
            temp = temp % num1.base;
            carry = 1;
        }

        result.number.push_back(temp);
    }

    if (carry == 1)
    {
        result.number.push_back(1);
    }

    std::reverse(result.number.begin(), result.number.end());

    return result;
}