---------------------------- Original.h

class Original {
public:
    Original(int x);
};

---------------------------- Original.cpp

Original::Original(int x) {
    /// Do some stuffs
}

---------------------------- CopyCat.h

class CopyCat : public Original {
    CopyCat() : Original(69) { /// Huehuehue 69
         /// Empty constructor calling original
    }
};

----------------------------