Clock.H

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// -*- C++ -*- class to measure CPU time.
// $Id: Clock.H,v 1.1.1.1 2006/10/06 08:01:40 trebuche Exp $
//
// Written by Jan O. Babst (jan.babst@erlangen.netsurf.de)
//

#ifndef _Clock_h
#define _Clock_h

#include <ctime>

class Clock
{
public:
  // Construct and start clock immediately.
  //
  Clock() : start_(clock()), running(true) {};

  ~Clock() {};

  // Start clock; same effect as constructor.
  //
  void start()
  {
    start_ = clock();
    running = true;
  }    

  // Time returned by time() is from start of clock
  // until the call of this function.
  //
  void stop()
  {
    stop_ = clock();
    running = false;
  }

  // Return elapsed CPU time from start of clock until the call
  // of stop(), or the current value if clock is running.
  //
  double time()
  {
    if (running)
      return (double)(clock() - start_) / CLOCKS_PER_SEC;
    else
    return (double)(stop_ - start_) / CLOCKS_PER_SEC;
  }

private:
  clock_t start_;
  clock_t stop_;
  bool running;
};

#endif // //_Clock_h