// Example program
#include <iostream>
using namespace std;

template<typename T>
class Base {
    public:
    int var;
    Base(){
        var = 5;
    }
};

template<class T>
class Derived : public Base<T> {
    public:
    Derived() {
        this.var = 10;
    }
};

int main()
{
  Base<int>* pntr = new Base;
  Derived<int>* pntr2 = (*Derived)pntr;
  Base<int>* pntr3 = dynamic_cast<*Base>(pntr2);
}