persistable sclass TradingCandles extends NotifyingList<TradingCandle> {
  *() {}
  *(List<TradingCandle> *list) { super(list); }
  
  // how high a high is (lol)
  IntPair highLevel(int idx) {
    ret intPair(highLeft(idx), highRight(idx));
  }
  
  int highLeft(int idx) {
    double high = get(idx).high();
    for (int j = 1; j < idx; j++)
      if (get(idx-j).high() > high)
        ret j-1;
    ret idx;
  }
  
  int highRight(int idx) {
    double high = get(idx).high();
    int n = size();
    for (int j = 1; j < n-idx; j++)
      if (get(idx+j).high() > high)
        ret j-1;
    ret n-idx;
  }
  
  // how low a low is (see highs)
  IntPair lowLevel(int idx) {
    ret intPair(lowLeft(idx), lowRight(idx));
  }
  
  int lowLeft(int idx) {
    double low = get(idx).low();
    for (int j = 1; j < idx; j++)
      if (get(idx-j).low() < low)
        ret j-1;
    ret idx;
  }
  
  int lowRight(int idx) {
    double low = get(idx).low();
    int n = size();
    for (int j = 1; j < n-idx; j++)
      if (get(idx+j).low() < low)
        ret j-1;
    ret n-idx;
  }
}