Next we need to paste the below code to the Event-id_eg.cc file and save the file in the ns3/scratch folder.

Code:

#include “ns3/core-module.h”

#include “ns3/event-id.h”

using namespace ns3;

void MyFunction() {

    std::cout << “Event executed at: ” << Simulator::Now().GetSeconds() << ” seconds” << std::endl;

}

int main(int argc, char *argv[]) {

    Time::SetResolution(Time::NS);

    EventId eventId = Simulator::Schedule(Seconds(2.0), &MyFunction);

    std::cout << “Before cancel – IsRunning: ” << eventId.IsRunning() << “, IsExpired: ” << eventId.IsExpired() << std::endl;

    eventId.Cancel();

    std::cout << “After cancel – IsRunning: ” << eventId.IsRunning() << “, IsExpired: ” << eventId.IsExpired() << std::endl;

    eventId = Simulator::Schedule(Seconds(4.0), &MyFunction);

    std::cout << “Rescheduled – IsRunning: ” << eventId.IsRunning() << “, IsExpired: ” << eventId.IsExpired() << std::endl;

    Simulator::Run();

    std::cout << “After running – IsRunning: ” << eventId.IsRunning() << “, IsExpired: ” << eventId.IsExpired() << std::endl;

    Simulator::Destroy();

    return 0;

}