import static com.google.common.collect.Sets.newConcurrentHashSet;
import static java.util.Objects.requireNonNull;
import static java.util.concurrent.atomic.AtomicIntegerFieldUpdater.newUpdater;
import static java.util.concurrent.atomic.AtomicReferenceFieldUpdater.newUpdater;

import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.VisibleForTesting;
import com.google.j2objc.annotations.ReflectionSupport;

  private static final long serialVersionUID = 0L;

  private transient volatile long value;

  private static final AtomicLongFieldUpdater<AtomicDouble> updater =
      AtomicLongFieldUpdater.newUpdater(AtomicDouble.class, "value");

  /**
   * Creates a new {@code AtomicDouble} with the given initial value.
   *
   * @param initialValue the initial value
   */
  public AtomicDouble(double initialValue) {