#include <boost/deconstruct_ptr.hpp>
#include <boost/enable_shared_from_this.hpp>
#include <boost/postconstructible.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/thread_safe_signal.hpp>
#include <iostream>

boost::signal<void ()> sig;

class Foo: public boost::enable_shared_from_this<Foo>,
  public boost::postconstructible
{
public:
  static boost::shared_ptr<Foo> create()
  {
    return boost::deconstruct_ptr(new Foo());
  }
  virtual void postconstruct()
  {
    typedef typeof(sig) sig_type;
    sig.connect(
      sig_type::slot_type(&Foo::some_func, this).track(shared_from_this()));
  }
  void some_func()
  {
    std::cout << __PRETTY_FUNCTION__ << std::endl;
    /*...*/
  }
private:
  Foo() {/*...*/}
};

int main()
{
  boost::shared_ptr<Foo> f = Foo::create();
  sig();
  f.reset();
  sig();
  return 0;
}