@GwtCompatible
final class LongAdder extends Striped64 implements Serializable, LongAddable {
  @GwtIncompatible @J2ktIncompatible   private static final long serialVersionUID = 7249069246863182397L;

  /** Version of plus for use in retryUpdate */
  @Override
  final long fn(long v, long x) {
    return v + x;
  }

  /** Creates a new adder with initial sum of zero. */
  public LongAdder() {}

  /**
   * Adds the given value.
   *