struct Stage{
	int	stageID;
	int	stageDuration;
};

struct SignalScheduleMessage : AMessage {
   Time time;
   int nCycleID;
   int nStages;
   Vector<Stage> stages;

   virtual void Serialize(Stream& s) {
       s % time % nCycleID % nStages;
       for(int i=0; i<stages.GetCount(); i++)
           s % stages[i].stageID % stages[i].stageDuration;
   }
};

   RegisterMessage<SignalScheduleMessage>(3); // do that for all of your messages

#include <Core/Core.h>



namespace Upp {
	
struct AMessage {
   virtual void Serialize(Stream& s) = 0;
   virtual ~AMessage() {}
};

typedef Function< void (One<AMessage>&) > MessageMake;

VectorMap<int, MessageMake> message_maker;

template <class T>
void RegisterMessage(int messageid)
{
    message_maker.Add(messageid, [](One<AMessage>& m) { m.Create<T>(); });
}


// =============================
//     Messages definition
// =============================
struct TemperatureMessage : AMessage {
   double altitude, temperature;

   virtual void Serialize(Stream& s) {
       s % altitude % temperature;
   }
};


struct WarningMessage : AMessage {
   String text;

   virtual void Serialize(Stream& s) {
       s % text;
   }
};

struct Stage{
	int	stageID;
	int	stageDuration;
};

struct SignalScheduleMessage : AMessage {
   Time time;
   int nCycleID;
   int nStages;
   Vector<Stage> stages;

   virtual void Serialize(Stream& s) {
       s % time % nCycleID % nStages;
       for(int i=0; i<stages.GetCount(); i++)
           s % stages[i].stageID % stages[i].stageDuration;
   }
};

// =============================
//     Message registeration
// =============================


INITBLOCK {
   RegisterMessage<TemperatureMessage>(1); // do that for all of your messages
   RegisterMessage<WarningMessage>(2); // do that for all of your messages
   RegisterMessage<SignalScheduleMessage>(3); // do that for all of your messages
};

void ProcessRequest(const String& data)
{
   StringStream ss(data); // error handling for now omitted
   int client_id = ss.Get32();
   int message_id = ss.Get32();
   One<AMessage> m;
   int q = message_maker.Find(message_id);
   if(q < 0)
      return;
   (message_maker[q])(m); // create the required concrete message
   ss % *m; // load data to struct
}

}
using namespace Upp;

CONSOLE_APP_MAIN
{
}