*
   * <p>Cancelling a delegate future propagates to input futures once all the delegates complete,
   * either from cancellation or because an input future has completed. If N futures are passed in,
   * and M delegates are cancelled, the remaining M input futures will be cancelled once N - M of
   * the input futures complete. If all the delegates are cancelled, all the input futures will be

   *
   * <p>Cancelling a delegate future propagates to input futures once all the delegates complete,
   * either from cancellation or because an input future has completed. If N futures are passed in,
   * and M delegates are cancelled, the remaining M input futures will be cancelled once N - M of
   * the input futures complete. If all the delegates are cancelled, all the input futures will be

    SettableFuture<Object> future1 = SettableFuture.create();
    SettableFuture<Object> future2 = SettableFuture.create();
    SettableFuture<Object> future3 = SettableFuture.create();
    ListenableFuture<List<Object>> all = allAsList(future1, future2, future3);

    future1.setException(new MyException());
    future2.setException(new MyException());
    future3.setException(new MyException());

    try {

    SettableFuture<Object> future1 = SettableFuture.create();
    SettableFuture<Object> future2 = SettableFuture.create();
    SettableFuture<Object> future3 = SettableFuture.create();
    ListenableFuture<List<Object>> all = allAsList(future1, future2, future3);

    future1.setException(new MyException());
    future2.setException(new MyException());
    future3.setException(new MyException());

    try {

      // listener, and set this.futures to null.
      // This is not actually a problem, since the foreach only needs this.futures to be non-null
      // at the beginning of the loop.
      int i = 0;
      for (ListenableFuture<? extends InputT> future : futures) {
        int index = i++;
        future.addListener(
            () -> {
              try {
                if (future.isCancelled()) {

      // listener, and set this.futures to null.
      // This is not actually a problem, since the foreach only needs this.futures to be non-null
      // at the beginning of the loop.
      int i = 0;
      for (ListenableFuture<? extends InputT> future : futures) {
        int index = i++;
        future.addListener(
            () -> {
              try {
                if (future.isCancelled()) {

  CollectionFuture(
      ImmutableCollection<? extends ListenableFuture<? extends V>> futures,
      boolean allMustSucceed) {
    super(futures, allMustSucceed, true);

    List<@Nullable Present<V>> values =
        futures.isEmpty()
            ? Collections.<@Nullable Present<V>>emptyList()
            : Lists.<@Nullable Present<V>>newArrayListWithCapacity(futures.size());

    // Populate the results list with null initially.

  CollectionFuture(
      ImmutableCollection<? extends ListenableFuture<? extends V>> futures,
      boolean allMustSucceed) {
    super(futures, allMustSucceed, true);

    List<@Nullable Present<V>> values =
        futures.isEmpty()
            ? Collections.<@Nullable Present<V>>emptyList()
            : Lists.<@Nullable Present<V>>newArrayListWithCapacity(futures.size());

    // Populate the results list with null initially.

    }

    private final ClosingFuture<V1> future1;
    private final ClosingFuture<V2> future2;
    private final ClosingFuture<V3> future3;

    private Combiner3(
        ClosingFuture<V1> future1, ClosingFuture<V2> future2, ClosingFuture<V3> future3) {
      super(true, ImmutableList.of(future1, future2, future3));
      this.future1 = future1;
      this.future2 = future2;
      this.future3 = future3;
    }

import static com.google.common.truth.Truth.assertThat;
import static com.google.common.util.concurrent.Futures.getDone;
import static com.google.common.util.concurrent.Futures.immediateCancelledFuture;
import static com.google.common.util.concurrent.Futures.immediateFailedFuture;
import static com.google.common.util.concurrent.Futures.immediateFuture;

import com.google.common.annotations.GwtCompatible;