public virtual void subscribe(string topic, string subExpression, MessageOrderListener listener)
 {
     ONSClient4CPPPINVOKE.OrderConsumer_subscribe(swigCPtr, topic, subExpression, MessageOrderListener.getCPtr(listener));
 }
 internal static HandleRef getCPtr(MessageOrderListener obj)
 {
     return(obj == null ? new HandleRef(null, IntPtr.Zero) : obj.swigCPtr);
 }