#include <boost/shared_ptr.hpp>

#include <iostream>

class A;

class B {
public:
  typedef int type;
};

template<typename Tag>
class Wrapper {
  typedef typename Tag::type type;
public:
  void print(void) {
    std::cout << "Here!\n";
  }  
};

class Action {
public:
  void doSomething(boost::shared_ptr<Wrapper<A> > p);
  void doSomething(boost::shared_ptr<Wrapper<B> > p) {
    p->print();
  }
};

int main(void) 
{
  boost::shared_ptr<Wrapper<B> > p(new Wrapper<B>);
  Action a;
  a.doSomething(p);
}