#ifndef __MICRO_TIME_H__
#define __MICRO_TIME_H__

#include <sys/time.h>

class Time {
 private:
  struct timeval t;

public:
  Time() { 
    struct timezone junk;
    gettimeofday(&t, &junk);
  }

  /***************************************
   * Updates the current time and returns
   *    the number of microseconds elapsed
   *    since the last update.
   *    Warning if the time difference is REALLY HUGE! (A few years!)
   *            this will be incorrect!
   *    Should throw an exception - but doesn't!
   ***************************************/
  long update() {
    Time newTime;
    long dus = newTime - *this;
    t = newTime.t;
    return dus;
  }

  /***************************************
   * Returns t - u in microseconds (millionths)
   *    Warning if the time difference is HUGE!
   *            this will be incorrect!
   *    Should throw an exception - but doesn't!
   ***************************************/
  friend long operator-(const Time& t, const Time& u) {
    long ds = t.t.tv_sec - u.t.tv_sec;
    long dus = t.t.tv_usec - u.t.tv_usec;
    return ds * 1000000 + dus;
  }

  friend ostream& operator<<(ostream& out, const Time& t) {
    double e = t.t.tv_sec % 10 + ((double) t.t.tv_usec)/1000000;
    return out << t.t.tv_sec/10 << e;
  }
};

#endif