template<typename Signature, typename OutSignal = unfused, 
         typename Combiner = boost::last_value<typename boost::function_types::result_type<Signature>::type>, 
         typename Group = int, typename GroupCompare = std::less<Group> > 
class socket_receiver : public boost::signals::storage< Signature, OutSignal, Combiner, Group, GroupCompare >
{
public:
  // construct/copy/destruct
  socket_receiver(asio::ip::tcp::socket &);

  // public member functions
  void operator()() ;
};