#include <iostream> 
#include <memory>

using namespace std;

class Base {
    public:
       Base() {};
       virtual ~Base() = default;
       virtual void Method1(){ cout << "base m1" << endl; };
       void Method2(){ cout << "base m2" << endl; };
};

class Derived: public Base {
    public:
       Derived():Base() { };
       //virtual ~Derived() = default;

       void Method1(){ cout << "derived m1" << endl; };
       void Method3(){
          cout << "derived m3 " << data << endl; 
       };
    private: 
       int data{3};
};

int main() {
    Base * b;
    Derived * d;

    d = new Derived;

    cout << "Creating a derived class " << endl;
    cout << "As Derived " << endl;
    d->Method1();
    d->Method2();
    d->Method3();

    cout << endl;
    cout << "As Base " << endl;
    b = d;
    b->Method1();
    b->Method2();
    //b->Method3();
    
    delete d;

    cout << endl;
    cout << "Creating a base class " << endl;

    b = new Base;
    cout << "As base " << endl;
    b->Method1();
    b->Method2();


    cout << endl;
    d = reinterpret_cast<Derived *>(b);
    cout << "As derived " << endl;
    d->Method1();
    d->Method2();
    d->Method3();

    delete d;

    return 0;
}