sample-simulator.cc

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/*
 * Copyright (c) 2010 INRIA
 *
 * SPDX-License-Identifier: GPL-2.0-only
 *
 * Authors: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
 */
 
#include "ns3/command-line.h"
#include "ns3/double.h"
#include "ns3/nstime.h"
#include "ns3/random-variable-stream.h"
#include "ns3/simulator.h"
 
#include <iostream>
 
/**
 * @file
 * @ingroup core-examples
 * @ingroup simulator
 * Example program demonstrating use of various Schedule functions.
 */
 
using namespace ns3;
 
namespace
{
 
/** Simple model object to illustrate event handling. */
class MyModel
{
  public:
    /** Start model execution by scheduling a HandleEvent. */
    void Start();
 
  private:
    /**
     *  Simple event handler.
     *
     * @param [in] eventValue Event argument.
     */
    void HandleEvent(Time eventValue);
};
 
void
MyModel::Start()
{
    Simulator::Schedule(Seconds(10), &MyModel::HandleEvent, this, Simulator::Now());
 
    Simulator::Schedule(Seconds(11), []() {
        std::cout << "Lambda scheduled from within a class method at "
                  << Simulator::Now().As(Time::S) << std::endl;
    });
}
 
void
MyModel::HandleEvent(Time value)
{
    std::cout << "Member method received event at " << Simulator::Now().As(Time::S)
              << " started at " << value.As(Time::S) << std::endl;
}
 
/**
 * Simple function event handler which Starts a MyModel object.
 *
 * @param [in] model The MyModel object to start.
 */
void
ExampleFunction(MyModel* model)
{
    std::cout << "ExampleFunction received event at " << Simulator::Now().As(Time::S) << std::endl;
    model->Start();
}
 
/**
 * Simple function event handler; this function is called randomly.
 */
void
RandomFunction()
{
    std::cout << "RandomFunction received event at " << Simulator::Now().As(Time::S) << std::endl;
}
 
/** Simple function event handler; the corresponding event is cancelled. */
void
CancelledEvent()
{
    std::cout << "I should never be called... " << std::endl;
}
 
} // unnamed namespace
 
int
main(int argc, char* argv[])
{
    CommandLine cmd(__FILE__);
    cmd.Parse(argc, argv);
 
    MyModel model;
    Ptr<UniformRandomVariable> v = CreateObject<UniformRandomVariable>();
    v->SetAttribute("Min", DoubleValue(10));
    v->SetAttribute("Max", DoubleValue(20));
 
    Simulator::Schedule(Seconds(10), &ExampleFunction, &model);
 
    Simulator::Schedule(Seconds(v->GetValue()), &RandomFunction);
 
    EventId id = Simulator::Schedule(Seconds(30), &CancelledEvent);
    Simulator::Cancel(id);
 
    Simulator::Schedule(Seconds(25), []() {
        std::cout << "Code within a lambda expression at time " << Simulator::Now().As(Time::S)
                  << std::endl;
    });
 
    Simulator::Run();
 
    Simulator::Destroy();
 
    return 0;
}