}

  @Override
  public final State state() {
    return snapshot.externalState();
  }

  /**
   * @since 14.0
   */
  @Override
  public final Throwable failureCause() {
    return snapshot.failureCause();
  }

  /**
   * @since 13.0
   */
  @Override
  public final void addListener(Listener listener, Executor executor) {
    listeners.addListener(listener, executor);

    - [Node Binaries](#node-binaries-15)
  - [Changelog since v1.17.1](#changelog-since-v1171)
- [v1.17.1](#v1171)
  - [Downloads for v1.17.1](#downloads-for-v1171)
    - [Client Binaries](#client-binaries-16)
    - [Server Binaries](#server-binaries-16)
    - [Node Binaries](#node-binaries-16)
  - [Changelog since v1.17.0](#changelog-since-v1170)
    - [Other notable changes](#other-notable-changes)
- [v1.17.0](#v1170)

   *
   * <p>If you have a {@code Stream<Double>} rather than a {@code DoubleStream}, you should collect
   * the values using {@link #toStats()} instead.
   *
   * @param values a series of values
   * @since 28.2 (but only since 33.4.0 in the Android flavor)
   */
  public static Stats of(DoubleStream values) {
    return values
        .collect(StatsAccumulator::new, StatsAccumulator::add, StatsAccumulator::addAll)

  - [Changelog since v1.15.9](#changelog-since-v1159)
  - [Changes by Kind](#changes-by-kind-2)
    - [Other (Bug, Cleanup or Flake)](#other-bug-cleanup-or-flake-1)
- [v1.15.9](#v1159)
  - [Downloads for v1.15.9](#downloads-for-v1159)
    - [Client Binaries](#client-binaries-3)
    - [Server Binaries](#server-binaries-3)
    - [Node Binaries](#node-binaries-3)
  - [Changelog since v1.15.8](#changelog-since-v1158)
- [v1.15.8](#v1158)

            <code>central</code> or <code>*,!repo1</code>.
            <code>*</code>, <code>external:*</code> and <code>external:http:*</code> (since Maven 3.8.0) have
            a special meaning: see <a href="/guides/mini/guide-mirror-settings.html">Mirror Settings</a> guide.
            ]]>
          </description>
        </field>
        <field>

 *       protected Integer computeNext(Integer previous) {
 *         return (previous == 1 << 30) ? null : previous * 2;
 *       }
 *     };
 * }
 *
 * @author Chris Povirk
 * @since 12.0 (in Guava as {@code AbstractLinkedIterator} since 8.0)
 */
@GwtCompatible
public abstract class AbstractSequentialIterator<T> extends UnmodifiableIterator<T> {
  private @Nullable T nextOrNull;

  /**

  - [Changelog since v1.16.5](#changelog-since-v1165)
- [v1.16.5](#v1165)
  - [Downloads for v1.16.5](#downloads-for-v1165)
    - [Client Binaries](#client-binaries-11)
    - [Server Binaries](#server-binaries-11)
    - [Node Binaries](#node-binaries-11)
  - [Changelog since v1.16.4](#changelog-since-v1164)
    - [Other notable changes](#other-notable-changes)
- [v1.16.4](#v1164)

 *
 * <p>The {@code toString} method is forwarded to the delegate. Although this class does not
 * implement {@link Serializable}, a serializable subclass may be created since this class has a
 * parameter-less constructor.
 *
 * @author Mike Bostock
 * @since 2.0
 */
@GwtCompatible
public abstract class ForwardingObject {

  /** Constructor for use by subclasses. */
  protected ForwardingObject() {}

  /**

   * while the {@link OutputStream} method returns a new instance whose {@code write} methods throw
   * if called on a closed stream.
   *
   * @since 14.0 (since 1.0 as com.google.common.io.NullOutputStream)
   */
  public static OutputStream nullOutputStream() {
    return NULL_OUTPUT_STREAM;
  }

  /**

    String reportItem(Item<?> item);
  }

  /**
   * A word about using {@link Equivalence}, which automatically checks for {@code null} and
   * identical inputs: This sounds like it ought to be a problem here, since the goals of this class
   * include testing that {@code equals()} is reflexive and is tolerant of {@code null}. However,
   * there's no problem. The reason: {@link EqualsTester} tests {@code null} and identical inputs