// In header: <boost/mixin/message.hpp>


struct message_t : public boost::mixin::feature {
  // types
  typedef message_feature_tag feature_tag;

  enum e_mechanism { unicast, multicast, num_mechanism_types };

  // construct/copy/destruct
  message_t(const char *, e_mechanism, bool);

  // public data members
  const e_mechanism mechanism;
};