template <typename CMD>
class Version
{
public:
    Version(ByteVector &byteVector) : byteVector(byteVector) {};

    Object<DATA<CMD>>   cls_DATA();
    Object<USR<CMD>>    cls_USR();
    Object<AUTH<CMD>>   cls_AUTH();
    Object<CONN<CMD>>   cls_CONN();
private:
    ByteVector &byteVector;
};

template<typename CMD>
inline Object<AUTH<CMD>> Version<CMD>::cls_AUTH()
{
    return Object<AUTH<CMD>>(byteVector);
}

template <>
class Version<AOPEN>
{
public:
    Version(ByteVector &byteVector) : byteVector(byteVector) {};

    Object<AUTH<AOPEN>> cls_AUTH();
private:
    ByteVector &byteVector;
};