time_tracker.h

这是一个用于数据挖掘的常用算法的模板库（数据挖掘的C++模板库for UNIX)

/*
 *  Copyright (C) 2005 M.J. Zaki <[e-mail]> Rensselaer Polytechnic Institute
 *  Written by [e-mail]
 *  Updated by [e-mail], [e-mail], [e-mail]
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version 2
 *  of the License, or (at your option) any later version.
 *
 *  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.
 */
#ifndef _TT_H
#define _TT_H

#include <sys/time.h>
#include <unistd.h>

#define microsec 1000000.0

/**
 * \brief An auxilary class to keep track of the running time statistics.
 */

class time_tracker {
 private:
  struct timeval start_time;
  struct timeval stop_time;
  bool  running;
  double curr_time;
 public:
  time_tracker() {
    running=false;
    curr_time=0;
  }

  /** Start the timer */
  void start() {
    gettimeofday(&start_time, (struct timezone *)0);
    running=true;
  }

  /** Stop the timer and return the total time taken */
  void stop() {
    double st, en;
    if (!running) return;
    else {
      gettimeofday(&stop_time, (struct timezone *)0);
      st = start_time.tv_sec + (start_time.tv_usec/microsec);
      en = stop_time.tv_sec + (stop_time.tv_usec/microsec);
      running=false;
      curr_time+=en-st;
    }
  }

  double print() const
  { return curr_time; }
};

#endif