timer.h

#include <time.h>

/*This class represents a timer.  A timer can be used to calculate the 
time it took for a piece of code to be run.  It uses the actual time in 
processing as opposed to the wall clock so that differences in load on a 
system will not affect the timing of the code.  This object is like a stop 
watch.

When initialized, the timer is set to 0.  In order to start timing, the 
start() function must be used.  

The following are the member functions of Timer and their usage:

  start();  starts the clock running from the current time
  currtime();  returns the current time
  stop();  stops the clock without reseting its value
  reset();  stops the clock and resets the timer to 0
*/

class Timer{
  clock_t starttime_;
  clock_t stoptime_;
  int isstop_;
public:
  Timer();
  void reset();
  void start();
  void stop();
  double currtime();
  double starttime();
};