while (true) {
      long current = longs.get(i);
      double currentVal = longBitsToDouble(current);
      double nextVal = updaterFunction.applyAsDouble(currentVal);
      long next = doubleToRawLongBits(nextVal);
      if (longs.compareAndSet(i, current, next)) {
        return nextVal;
      }
    }
  }

  /**
   * Returns the String representation of the current values of array.
   *