#include <boost/bind.hpp>
#include <boost/function.hpp>
#include <stdio.h>

class Base
{
 public:
  virtual void foo()
  {
    printf("Base::foo\n");
  }
};

class Derived : public Base
{
 public:
  virtual void foo()
  {
    printf("Derived::foo\n");
  }
};

int main()
{
  Base* pb = new Derived;
  boost::function<void()> f = boost::bind(&Base::foo, pb);
  f();  // prints "Derived::foo"
}