Method addBothDeferring

src/Deferred.java:780–785

Registers a callback both as a callback and as an "errback". This has the exact same effect as #addBoth, but keeps the type information "correct" when the callback to add returns a Deferred. @param cb The callback to register. @return this with an "updated" type.

(final Callback<D, T> cb)

   * @return {@code this} with an "updated" type.
   */
  @SuppressWarnings("unchecked")
  public <R, D extends Deferred<R>>
    Deferred<R> addBothDeferring(final Callback<D, T> cb) {
    return addCallbacks((Callback<R, T>) ((Object) cb),
                        (Callback<R, T>) ((Object) cb));
  }

  /**
   * Chains another {@code Deferred} to this one.