/*

 * Copyright (c) 2005 INRIA

 * All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation;

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 *

 * Author: Mathieu Lacage <mathieu.lacage.inria.fr>

 */

#ifndef SYSTEM_WALL_CLOCK_MS_H

#define SYSTEM_WALL_CLOCK_MS_H

namespace ns3 {

/**

 * \brief measure wall-clock time in milliseconds

 */

class SystemWallClockMs {

public:

    SystemWallClockMs ();

    ~SystemWallClockMs ();

    /**

     * Start a measure.

     */

    void Start (void);

    /**

     * \returns the measured elapsed wall clock time since 

     *          ns3::SystemWallClockMs::start was invoked.

     *

     * It is possible to start a new measurement with ns3::SystemWallClockMs::start

     * after this method returns.

     */

    unsigned long long End (void);

private:

    class SystemWallClockMsPrivate *m_priv;

};

}; // namespace ns3

#endif /* SYSTEM_WALL_CLOCK_MS_H */