30 #ifndef __ZMQ_I_ENGINE_HPP_INCLUDED__ 31 #define __ZMQ_I_ENGINE_HPP_INCLUDED__ virtual void terminate()=0
virtual void plug(zmq::io_thread_t *io_thread_, class session_base_t *session_)=0
virtual void restart_input()=0
virtual void zap_msg_available()=0
virtual void restart_output()=0