sclass DoomEstimator {
  long time1, time2;
  double value1, value2;
  double minValue;
  Long doomDate;
  
  *() {}
  *(double *minValue) {}

  // returns true if there is enough info for computing a doom date
  bool consumeValue(double value) {
    time1 = time2;
    value1 = value2;
    time2 = sysNow();
    value2 = value;
    if (time1 == 0) false;
    doomDate = ai_calculateDateOfDoom(time1, value1, time2, value2, minValue);
    true;
  }
  
  bool doomDateReady() { ret time1 != 0; }
}