class T {          // base class

public:
};

class TA : public T {
private:
  double md_num;
public:
};

class TB : public T {
private:
  bool mb_xx;
public:
};

void AnyFunction() {
  TA  Ta, Tb;
  T   *pT1, *pT2;

  pT1 = &TA

  // now we want to deep-copy pT1 to have it in pT2

  pT2 = new ???actual typeinfo needed??? (*pT1);   // I don't know what to write there

}