fatal-example.cc

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/*
 * Copyright (c) 2020 Lawrence Livermore National Laboratory
 *
 * SPDX-License-Identifier: GPL-2.0-only
 *
 * Author: Peter D. Barnes, Jr. <pdbarnes@llnl.gov>
 */
 
#include "ns3/assert.h"
#include "ns3/fatal-error.h"
#include "ns3/simulator.h"
 
#include <iostream>
 
/**
 * \file
 * \defgroup fatal-example Core example: NS_FATAL error handlers
 * \ingroup core-examples
 * \ingroup fatal
 *
 * Example program illustrating use of the NS_FATAL error handlers.
 */
 
using namespace ns3;
 
/**
 * \ingroup fatal-example
 * \brief Triggers a fatal error without message, deferring termination.
 */
void
FatalNoMsg()
{
    std::cerr << "\nEvent triggered fatal error without message, and continuing:" << std::endl;
    NS_FATAL_ERROR_NO_MSG_CONT();
}
 
/**
 * \ingroup fatal-example
 * \brief Triggers a fatal error with an error message, deferring termination.
 */
void
FatalCont()
{
    std::cerr << "\nEvent triggered fatal error, with custom message, and continuing:" << std::endl;
    NS_FATAL_ERROR_CONT("fatal error, but continuing");
}
 
/**
 * \ingroup fatal-example
 * \brief Triggers a fatal error with message, and terminating.
 */
void
Fatal()
{
    std::cerr << "\nEvent triggered fatal error, with message, and terminating:" << std::endl;
    NS_FATAL_ERROR("fatal error, terminating");
}
 
int
main(int argc, char** argv)
{
    // First schedule some events
    Simulator::Schedule(Seconds(1), FatalNoMsg);
    Simulator::Schedule(Seconds(2), FatalCont);
    Simulator::Schedule(Seconds(3), Fatal);
 
    // Show some errors outside of simulation time
    std::cerr << "\nFatal error with custom message, and continuing:" << std::endl;
    NS_FATAL_ERROR_CONT("fatal error, but continuing");
 
    std::cerr << "\nFatal error without message, and continuing:" << std::endl;
    NS_FATAL_ERROR_NO_MSG_CONT();
 
    // Now run the simulator
    Simulator::Run();
 
    // Should not get here
    NS_FATAL_ERROR("fatal error, terminating");
    NS_ASSERT_MSG(false, "Should not get here.");
 
    return 0;
}