#include <iostream>
struct T {
  int x;
  int y;
};
void f() {}
void f(int x) {}
void f(struct T y, T z) {}

class C {
public:
  virtual void f() { std::cout << "C::f\n"; }
  void g() { std::cout << "C::g\n"; }
};
class D : C {
public:
  void f() { std::cout << "D::f\n"; }
  void g() { std::cout << "D::g\n"; }
};

void g();

int main(int argc, char**argv) {
  std::cout << 42 << " + " << "19 =" << (42+19) << '\n';
  C* c1 = new C();
  D* d  = new D();
  C* c2 = (C*)d;
  c1->f();
  c1->g();
  (*d).f();
  d->g();
  c2->f();
  c2->g();
  g();
  return 0;
}

template <class T> class Lst {
public:
  T val;
  class Lst<T> * tail;
};
template <class T> class Lst<T>* append(class Lst<T>*x,class Lst<T>*y) {
  return 0;
}
template <class T> int length(class Lst<T>*x) {
  int ans = 0;
  while(x != NULL) {
    ++ans;
    x = x->tail;
  }
}

void g() {
  class Lst<int> y;
  y.val = 3;
  y.tail = 0;
  length(&y);
  class Lst<double> z;
  z.val = 13.0;
  z.tail = 0;
  length(&z);
  std::cout << sizeof(y) << " " << sizeof(z) << '\n';
}