ZMQ_MONITOR socket option registers a callback / event sink for changes in socket state

src/stream_engine.hpp

@@ -30,6 +30,7 @@
 #include "encoder.hpp"
 #include "decoder.hpp"
 #include "options.hpp"
+#include "../include/zmq.h"
 
 namespace zmq
 {
@@ -96,6 +97,9 @@ namespace zmq
 
         options_t options;
 
+        // String representation of endpoint
+        std::string endpoint;
+
         bool plugged;
 
         stream_engine_t (const stream_engine_t&);