// This class provides a device to measure the cpu-time.
// Times are reported in seconds.
// E. Mayoraz, August 95


#ifndef chrono_h
#define chrono_h 


#include <iostream.h>



class chrono {
public:
  chrono();
	// creates and initializes a chrono
  double time() const;	
	// gives the time since the creation or the last restart
  double lap();
	// gives the time since the creation, the last restart or the last lap
  friend ostream& operator << (ostream& s, const chrono& c);
	// send one line on stream s with lap time and total time
  void   restart();
	// restart the chrono

private:
  double starttime, laptime;
};



#endif