#include <boost/signal.hpp>
#include <iostream>

using namespace std;

typedef boost::signal1<void,int>       ChangeSignal;
typedef ChangeSignal::slot_function_type         ChangeCallBack;

void run(int x)
{
  cerr << x << endl;
}

struct Bar
{
  void go(int i)
  {
    _change(i);
  }
  
  void init()
  {
    ChangeCallBack f = &run;
    _change.connect(f);
  }

     ChangeSignal                       _change;
};

int main()
{
  Bar b;
  b.init();
  b.go(10); // Should output 10
  return 0;

}