Templates in C++

#ifndef __T_H__
#define __T_H__

#include "u.h"

class T {

public:
  T() {}


  template<class UT>
  void print_u(const U<UT>& u) {
    u.print();
  };

};

#endif

#ifndef __U_H__
#define __U_H__

template <typename T>
class U {

  public:
    U(const T& t) : t_(t) {};

    void print() const;

private:
  T t_;
};

#endif

#include "u.h"

#include <iostream>
using namespace std;

template class U<int>;
template class U<char>;

template <class T>
void U<T>::print() const {
  cout << t_ << endl;
}

#include "u.h"
#include "t.h"


int main() {

  U<int>  u_5(5);
  U<char> u_f('f');

  T t;
  t.print_u(u_5);
  t.print_u(u_f);

  return 0;
}