gistfile1.cpp

class IP {
  enum family {
    INET,
    INET6
  };
  virtual ~IP() {}
  inline family getFamily() const {
    return _family;
  }
  virtual setSockAddrIn(sockaddr_in& data) const = 0;
  protected:
  IP(family fam) : _family(fam) {}
  private:
  family _family;
};

class IPV4 : public IP {
  public:
  IPV4(...) : IP(INET), ... {}
  virtual ~IPV4() {...}
  virtual setSockAddrIn(sockaddr_in& data) const {...}
  private:
  uint32_t ip;
}

class IPV6 : public IP {
  public:
  IPV6(...) : IP(INET6), ... {}
  virtual ~IPV6() {...}
  virtual setSockAddrIn(sockaddr_in& data) const {...}
  private:
  uint32_t ip[4];
}