persistable srecord noeq PriceDigitizer2(PriceCells cells) {
  settable int cellNumber;
  settable int lastCellNumber;
  settable bool verbose;
  
  // returns new digitized price
  double digitize(double price) {
    double cn = cells.toCellNumber(price);
    lastCellNumber = cellNumber;
    cellNumber = iroundTowards(cn, cellNumber);
    ret digitizedPrice();
  }
  
  double digitizedPrice() { ret cells.fromCellNumber(cellNumber); }
  double lastDigitizedPrice() { ret cells.fromCellNumber(lastCellNumber); }
  
  // digitize price without looking at history
  double digitizeIndividually(double price) {
    double cn = cells.toCellNumber(price);
    ret cells.fromCellNumber(round(cn));
  }
}