* value).hashCode()}.
   *
   * <p><b>Java 8+ users:</b> use {@link Double#hashCode(double)} instead.
   *
   * @param value a primitive {@code double} value
   * @return a hash code for the value
   */
  public static int hashCode(double value) {
    return ((Double) value).hashCode();
    // TODO(kevinb): do it this way when we can (GWT problem):
    // long bits = Double.doubleToLongBits(value);

  public static int roundToInt(double x, RoundingMode mode) {
    double z = roundIntermediate(x, mode);
    checkInRangeForRoundingInputs(
        z > MIN_INT_AS_DOUBLE - 1.0 & z < MAX_INT_AS_DOUBLE + 1.0, x, mode);
    return (int) z;
  }

  private static final double MIN_INT_AS_DOUBLE = -0x1p31;
  private static final double MAX_INT_AS_DOUBLE = 0x1p31 - 1.0;

  /**

      Double[] suffix = {(double) 86, (double) 99};
      Double[] all = concat(concat(prefix, elements), suffix);
      return asList(all).subList(2, elements.length + 2);
    }
  }

  private static Double[] concat(Double[] left, Double[] right) {
    Double[] result = new Double[left.length + right.length];
    System.arraycopy(left, 0, result, 0, left.length);

                },
                new double[] {(double) 2, (double) 3, (double) 4}))
        .isEqualTo(2);
    assertThat(
            Doubles.indexOf(
                new double[] {
                  (double) 2, (double) 2, (double) 3, (double) 4, (double) 2, (double) 3, (double) 4
                },
                new double[] {(double) 2, (double) 3, (double) 4}))

                },
                new double[] {(double) 2, (double) 3, (double) 4}))
        .isEqualTo(2);
    assertThat(
            Doubles.indexOf(
                new double[] {
                  (double) 2, (double) 2, (double) 3, (double) 4, (double) 2, (double) 3, (double) 4
                },
                new double[] {(double) 2, (double) 3, (double) 4}))

    BigDecimal maxDoubleAsBD = new BigDecimal(Double.MAX_VALUE);
    new RoundToDoubleTester(maxDoubleAsBD).setExpectation(Double.MAX_VALUE, values()).test();
  }

  public void testRoundToDouble_maxDoublePlusOne() {
    BigDecimal maxDoubleAsBD = new BigDecimal(Double.MAX_VALUE).add(BigDecimal.ONE);
    new RoundToDoubleTester(maxDoubleAsBD)
        .setExpectation(Double.MAX_VALUE, DOWN, FLOOR, HALF_EVEN, HALF_UP, HALF_DOWN)

      Double[] suffix = {(double) 86, (double) 99};
      Double[] all = concat(concat(prefix, elements), suffix);
      return asList(all).subList(2, elements.length + 2);
    }
  }

  private static Double[] concat(Double[] left, Double[] right) {
    Double[] result = new Double[left.length + right.length];
    System.arraycopy(left, 0, result, 0, left.length);

    for (double positiveValue : POSITIVE_FINITE_DOUBLE_CANDIDATES) {
      assertEquals(positiveValue, DoubleUtils.ensureNonNegative(positiveValue));
      assertEquals(0.0, DoubleUtils.ensureNonNegative(-positiveValue));
    }
    assertEquals(Double.POSITIVE_INFINITY, DoubleUtils.ensureNonNegative(Double.POSITIVE_INFINITY));
    assertEquals(0.0, DoubleUtils.ensureNonNegative(Double.NEGATIVE_INFINITY));

  }

  public void testLog2NaNInfinity() {
    assertEquals(Double.POSITIVE_INFINITY, DoubleMath.log2(Double.POSITIVE_INFINITY));
    assertTrue(Double.isNaN(DoubleMath.log2(Double.NEGATIVE_INFINITY)));
    assertTrue(Double.isNaN(DoubleMath.log2(Double.NaN)));
  }

  @GwtIncompatible // StrictMath
  private strictfp double trueLog2(double d) {

     * @param pattern
     *            パターン文字列
     * @return 変換された{@link Double}
     */
    public static Double toDouble(final Object o, final String pattern) {
        if (o == null) {
            return null;
        } else if (o instanceof Double) {
            return (Double) o;
        } else if (o instanceof Number) {
            return new Double(((Number) o).doubleValue());
        } else if (o instanceof String) {