## Die Instanz als Abhängigkeit verwenden { #use-the-instance-as-a-dependency }

Dann könnten wir diesen `checker` in einem `Depends(checker)` anstelle von `Depends(FixedContentQueryChecker)` verwenden, da die Abhängigkeit die Instanz `checker` und nicht die Klasse selbst ist.

Und beim Auflösen der Abhängigkeit ruft **FastAPI** diesen `checker` wie folgt auf:

```Python

      // creating an ArrayList so filtering happens once
      return Lists.newArrayList(iterator()).toArray();
    }

    @Override
    @SuppressWarnings("nullness") // b/192354773 in our checker affects toArray declarations
    public <T extends @Nullable Object> T[] toArray(T[] array) {
      return Lists.newArrayList(iterator()).toArray(array);
    }
  }

  /**

## Використовувати екземпляр як залежність { #use-the-instance-as-a-dependency }

Далі ми можемо використати цей `checker` у `Depends(checker)` замість `Depends(FixedContentQueryChecker)`, адже залежністю є екземпляр `checker`, а не сам клас.

Коли залежність розв'язується, **FastAPI** викличе цей `checker` так:

```Python
checker(q="somequery")
```

     * perform runtime null checks on the input and output. (That would also make NullPointerTester
     * happy!) However, since we didn't do that for many years, we're not about to start now.
     * (Runtime checks could be particularly bad for users of LegacyConverter.)
     *
     * Luckily, our nullness checker is smart enough to realize that `convert` has @PolyNull-like

## Utilize a instância como dependência { #use-the-instance-as-a-dependency }

Então, nós podemos utilizar este `checker` em um `Depends(checker)`, no lugar de `Depends(FixedContentQueryChecker)`, porque a dependência é a instância, `checker`, e não a própria classe.

E quando a dependência for resolvida, o **FastAPI** chamará este `checker` como:

```Python
checker(q="somequery")

        if (scheduleFailure != null) {
          service.notifyFailed(scheduleFailure);
        }
        return toReturn;
      }

      @GuardedBy("lock")
      /*
       * The GuardedBy checker warns us that we're not holding cancellationDelegate.lock. But in
       * fact we are holding it because it is the same as this.lock, which we know we are holding,

      expectedModCount++;
      if (cursor < size()) {
        MoveDesc<E> moved = removeAt(cursor);
        if (moved != null) {
          // Either both are null or neither is, but we check both to satisfy the nullness checker.
          if (forgetMeNot == null || skipMe == null) {
            forgetMeNot = new ArrayDeque<>();
            skipMe = new ArrayList<>(3);
          }

## Utiliser l'instance comme dépendance { #use-the-instance-as-a-dependency }

Ensuite, nous pourrions utiliser ce `checker` dans un `Depends(checker)`, au lieu de `Depends(FixedContentQueryChecker)`, car la dépendance est l’instance, `checker`, et non la classe elle‑même.

Et lors de la résolution de la dépendance, **FastAPI** appellera ce `checker` comme ceci :

```Python

    if (firstEntry == null || lastEntry == null) {
      /*
       * Either both are null or neither is: Either the set is empty, or it's not. But we check both
       * to make the nullness checker happy.
       */
      throw new NoSuchElementException();
    }
    return Range.create(firstEntry.getValue().lowerBound, lastEntry.getValue().upperBound);
  }

  @Override

## Usar la instance como una dependencia { #use-the-instance-as-a-dependency }

Luego, podríamos usar este `checker` en un `Depends(checker)`, en lugar de `Depends(FixedContentQueryChecker)`, porque la dependencia es la instance, `checker`, no la clase en sí.

Y al resolver la dependencia, **FastAPI** llamará a este `checker` así:

```Python
checker(q="somequery")
```