// So we can ignore the bottom 8, except for rounding. See doubleValue() for more.
    return (float) ((value >>> 1) | (value & 1)) * 2f;
  }

  /**
   * Returns the value of this {@code UnsignedLong} as a {@code double}, analogous to a widening
   * primitive conversion from {@code long} to {@code double}, and correctly rounded.
   */
  @Override
  public double doubleValue() {
    if (value >= 0) {
      return (double) value;

  @Override
  public float floatValue() {
    return (float) sum();
  }

  /** Returns the {@link #sum} as a {@code double} after a widening primitive conversion. */
  @Override
  public double doubleValue() {
    return (double) sum();
  }

  private void writeObject(ObjectOutputStream s) throws IOException {
    s.defaultWriteObject();
    s.writeLong(sum());
  }

  }

  public void testDoubleValue() {
    for (int value : TEST_INTS) {
      UnsignedInteger unsignedValue = UnsignedInteger.fromIntBits(value);
      assertThat(unsignedValue.doubleValue())
          .isEqualTo(unsignedValue.bigIntegerValue().doubleValue());
    }
  }

  public void testPlus() {
    for (int a : TEST_INTS) {
      for (int b : TEST_INTS) {
        UnsignedInteger aUnsigned = UnsignedInteger.fromIntBits(a);

    for (int i = 0, n = 0; n <= DoubleMath.MAX_FACTORIAL; i++, n += 16) {
      assertThat(DoubleMath.everySixteenthFactorial[i])
          .isEqualTo(BigIntegerMath.factorial(n).doubleValue());
    }
  }

  @GwtIncompatible // DoubleMath.roundToInt(double, RoundingMode)
  public void testRoundIntegralDoubleToInt() {
    for (double d : INTEGRAL_DOUBLE_CANDIDATES) {

      UnsignedLong unsignedValue = UnsignedLong.fromLongBits(value);
      assertWithMessage("Double value of %s", unsignedValue)
          .that(unsignedValue.doubleValue())
          .isEqualTo(unsignedValue.bigIntegerValue().doubleValue());
    }
  }

  public void testPlus() {
    for (long a : TEST_LONGS) {
      for (long b : TEST_LONGS) {
        UnsignedLong aUnsigned = UnsignedLong.fromLongBits(a);

   */
  @Override
  public float floatValue() {
    return (float) get();
  }

  /** Returns the value of this {@code AtomicDouble} as a {@code double}. */
  @Override
  public double doubleValue() {
    return get();
  }

  /**
   * Saves the state to a stream (that is, serializes it).
   *
   * @serialData The current value is emitted (a {@code double}).
   */

    checkArgument(values.hasNext(), "Cannot take mean of 0 values");
    long count = 1;
    double mean = checkFinite(values.next().doubleValue());
    while (values.hasNext()) {
      double value = checkFinite(values.next().doubleValue());
      count++;
      // Art of Computer Programming vol. 2, Knuth, 4.2.2, (15)
      mean += (value - mean) / count;
    }
    return mean;
  }

   */
  public static double meanOf(Iterator<? extends Number> values) {
    checkArgument(values.hasNext());
    long count = 1;
    double mean = values.next().doubleValue();
    while (values.hasNext()) {
      double value = values.next().doubleValue();
      count++;
      if (isFinite(value) && isFinite(mean)) {
        // Art of Computer Programming vol. 2, Knuth, 4.2.2, (15)
        mean += (value - mean) / count;

    for (int i = 0, n = 0; n <= DoubleMath.MAX_FACTORIAL; i++, n += 16) {
      assertThat(DoubleMath.everySixteenthFactorial[i])
          .isEqualTo(BigIntegerMath.factorial(n).doubleValue());
    }
  }

  @GwtIncompatible // DoubleMath.roundToInt(double, RoundingMode)
  public void testRoundIntegralDoubleToInt() {
    for (double d : INTEGRAL_DOUBLE_CANDIDATES) {

   * Returns the value of this {@code UnsignedInteger} as a {@code double}, analogous to a widening
   * primitive conversion from {@code int} to {@code double}, and correctly rounded.
   */
  @Override
  public double doubleValue() {
    return longValue();
  }

  /** Returns the value of this {@code UnsignedInteger} as a {@link BigInteger}. */
  public BigInteger bigIntegerValue() {
    return BigInteger.valueOf(longValue());
  }