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Message from discussion On callbacks
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crai...@ee.washington.edu  
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 More options Sep 13 2009, 12:27 am
From: <crai...@ee.washington.edu>
Date: Sat, 12 Sep 2009 21:27:36 -0700
Local: Sun, Sep 13 2009 12:27 am
Subject: RE: On callbacks
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> Ok, currently I'm using tracecallbacks of type "Bool" and "Time". I
> guess bool could work as TracedValue as well, but how about Time?
> V4ping application uses TracedCallback<Time> m_traceRtt;

This kind of thing is actually pretty easy to check out (okay, okay, if you
know what to type).  Copy the following into, say, scratch/test.cc and build
it.  I think you'll find it works fine.  TracedValue<Time> will work if you
stay away from the operators that aren't defined for a Time (e.g., ++, --).

---------- Begin Included File ----------

#include <iostream>
#include "ns3/object.h"
#include "ns3/uinteger.h"
#include "ns3/nstime.h"
#include "ns3/traced-value.h"
#include "ns3/trace-source-accessor.h"

using namespace ns3;

class MyObject : public Object
{
public:
  static TypeId GetTypeId (void)
  {
    static TypeId tid = TypeId ("MyObject")
      .SetParent (Object::GetTypeId ())
      .AddConstructor<MyObject> ()
      .AddTraceSource ("MyTime",
                       "A Time value to trace.",
                       MakeTraceSourceAccessor (&MyObject::m_myTime))
      ;
    return tid;
  }

  MyObject () {}
  TracedValue<Time> m_myTime;

};

void
TimeTrace (Time oldValue, Time newValue)
{
  std::cout << "Traced " << oldValue << " to " << newValue << std::endl;

}

int
main (int argc, char *argv[])
{
  Ptr<MyObject> myObject = CreateObject<MyObject> ();

  myObject->TraceConnectWithoutContext ("MyTime", MakeCallback
(&TimeTrace));
  myObject->m_myTime = Seconds (1234.);

}

---------- End Included File ----------

 
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