*
 * @author Shardul Deo
 * @since 4.0
 */
@GwtCompatible
@ElementTypesAreNonnullByDefault
public abstract class ForwardingListenableFuture<V extends @Nullable Object>
    extends ForwardingFuture<V> implements ListenableFuture<V> {

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

  @Override
  protected abstract ListenableFuture<? extends V> delegate();