#include "Timer.h"

  extern struct timeval start;

  double Timer::timediff(struct timeval time1, struct timeval time2) {
  /* this function returns the difference between 2 struct timevals.  time2
  should be the later time */
    double result;
    
    result = time2.tv_sec-time1.tv_sec;
    result += (double)(time2.tv_usec-time1.tv_usec)/1000000;
    return(result);
  
  }; /* timediff(time1,time2) */

  Timer::Timer() {
    Reset();
  };

  Timer::~Timer() {}

  void Timer::Reset() {
  /* this sets the timer back to zero and returns 0 on success,
  -1 on failure */
    int failurep;

    failurep=gettimeofday(&start,NULL);
    if (failurep) {
      printf ("Reset failed\n");
    }

  }; /* Reset() */

  double Timer::Check() {
  /* this returns the time elapsed since Reset() was called 
  if gettimeofday fails, -1 is returned */
  
    struct timeval now;
  
    if (gettimeofday(&now,NULL))
      printf("Check failed\n");
    return(timediff(start,now));

  }; /* Check() */