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using ipv4 = uint32_t;

inline constexpr ipv4 to_ipv4(uint8_t oct1, uint8_t oct2, uint8_t oct3, uint8_t oct4) noexcept {


ipv4 result{0};


result |= oct1;


result <<= 8;


result |= oct2;


result <<= 8;


result |= oct3;


result <<= 8;


result |= oct4;


return result;
}

constexpr uint32_t to_uint32(std::string_view str)
{
   uint32_t result{0};
   uint32_t count{1};
   for(size_t i = str.size(); i != 0; --i)
   {
       result+=(str[i - 1] - '0') * count;
       count *= 10;
   }
   return result;
}

template<typename CharT, std::size_t N>
struct ipv4_basic_string {
   constexpr ipv4_basic_string(const CharT (&str)[N]) : data{0} {
       uint8_t oct1{0};


uint8_t oct2{0};


uint8_t oct3{0};


uint8_t oct4{0};
       std::string_view ip(str);



auto set_oct = [&ip](uint8_t & oct) constexpr {



auto pos = ip.find_first_of('.');



if (pos != std::string_view::npos) {
               oct = to_uint32(std::string_view(ip.data(), pos));




ip.remove_prefix(pos + 1);



} else {
          …