(socket server) add a callback to the ConnectionState to be invoked when the connection is terminated. This will be used by the SocketServer in the future to know on time that the associated connection thread can be terminated.

ixwebsocket/IXConnectionState.cpp

@@ -31,6 +31,11 @@ namespace ix
         return std::make_shared<ConnectionState>();
     }
 
+    void ConnectionState::setOnSetTerminatedCallback(const OnSetTerminatedCallback& callback)
+    {
+        _onSetTerminatedCallback = callback;
+    }
+
     bool ConnectionState::isTerminated() const
     {
         return _terminated;
@@ -39,5 +44,10 @@ namespace ix
     void ConnectionState::setTerminated()
     {
         _terminated = true;
+
+        if (_onSetTerminatedCallback)
+        {
+            _onSetTerminatedCallback();
+        }
     }
 } // namespace ix