return delegate().poll(timeout, unit);
  }

  @Override
  public void put(E e) throws InterruptedException {
    delegate().put(e);
  }

  @Override
  public int remainingCapacity() {
    return delegate().remainingCapacity();
  }

  @CanIgnoreReturnValue // TODO(kak): consider removing this
  @Override
  public E take() throws InterruptedException {
    return delegate().take();
  }

    assertEquals(1, Queues.newLinkedBlockingDeque(1).remainingCapacity());
    assertEquals(11, Queues.newLinkedBlockingDeque(11).remainingCapacity());
  }

  public void testNewLinkedBlockingQueueCapacity() {
    assertThrows(IllegalArgumentException.class, () -> Queues.newLinkedBlockingQueue(0));
    assertEquals(1, Queues.newLinkedBlockingQueue(1).remainingCapacity());

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

  @Override
  protected abstract BlockingDeque<E> delegate();

  @Override
  public int remainingCapacity() {
    return delegate().remainingCapacity();
  }

  @Override
  public void putFirst(E e) throws InterruptedException {
    delegate().putFirst(e);
  }

  @Override
  public void putLast(E e) throws InterruptedException {

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

  @Override
  protected abstract BlockingDeque<E> delegate();

  @Override
  public int remainingCapacity() {
    return delegate().remainingCapacity();
  }

  @Override
  public void putFirst(E e) throws InterruptedException {
    delegate().putFirst(e);
  }

  @Override
  public void putLast(E e) throws InterruptedException {

    return delegate().poll(timeout, unit);
  }

  @Override
  public void put(E e) throws InterruptedException {
    delegate().put(e);
  }

  @Override
  public int remainingCapacity() {
    return delegate().remainingCapacity();
  }

  @CanIgnoreReturnValue // TODO(kak): consider removing this
  @Override
  public E take() throws InterruptedException {
    return delegate().take();
  }

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

  @Override
  protected abstract BlockingDeque<E> delegate();

  @Override
  public int remainingCapacity() {
    return delegate().remainingCapacity();
  }

  @Override
  public void putFirst(E e) throws InterruptedException {
    delegate().putFirst(e);
  }

  @Override
  public void putLast(E e) throws InterruptedException {

  }

  /**
   * Returns the number of additional elements that this queue can accept without evicting; zero if
   * the queue is currently full.
   *
   * @since 16.0
   */
  public int remainingCapacity() {
    return maxSize - size();
  }

  @Override
  protected Queue<E> delegate() {
    return delegate;
  }

  /**

   *
   * <p>Note that you cannot always tell if an attempt to insert an element will succeed by
   * inspecting {@code remainingCapacity} because it may be the case that another thread is about to
   * insert or remove an element.
   */
  @CanIgnoreReturnValue
  @Override
  public int remainingCapacity() {
    Monitor monitor = this.monitor;
    monitor.enter();
    try {
      return items.length - count;

    override fun offer(
      element: T,
      timeout: Long,
      unit: TimeUnit,
    ) = error("unsupported")

    override fun take() = error("unsupported")

    override fun remainingCapacity() = error("unsupported")

    override fun drainTo(sink: MutableCollection<in T>) = error("unsupported")

    override fun drainTo(
      sink: MutableCollection<in T>,
      maxElements: Int,

   * not capacity constrained.
   *
   * @return {@code Integer.MAX_VALUE}
   */
  @CanIgnoreReturnValue // pushed down from class to method
  @Override
  public int remainingCapacity() {
    return Integer.MAX_VALUE;
  }

  /**
   * Removes a single instance of the specified element from this queue, if it is present. More