/** Implementation of an {@link Optional} not containing a reference. */
@GwtCompatible
final class Absent<T> extends Optional<T> {
  static final Absent<Object> INSTANCE = new Absent<>();

  @SuppressWarnings("unchecked") // implementation is "fully variant"
  static <T> Optional<T> withType() {
    return (Optional<T>) INSTANCE;
  }

  private Absent() {}

  @Override
  public boolean isPresent() {
    return false;
  }

## 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")
```

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package jcifs;

import java.io.IOException;

/**
 * Base for all checked exceptions used by this library
 *
 * @author mbechler
 *
 */
public class CIFSException extends IOException {

    /**
     *
     */
    private static final long serialVersionUID = 7806460518865806784L;

                MapFeature.ALLOWS_ANY_NULL_QUERIES,
                CollectionFeature.KNOWN_ORDER)
            .createTestSuite());

    return suite;
  }

  @SuppressWarnings({"rawtypes", "unchecked"})
  public void testForwarding() {
    new ForwardingWrapperTester()
        .testForwarding(
            Map.class,
            new Function<Map, Map>() {
              @Override

#
# Windows users contributing to Go will need to use a modern version
# of git and editors capable of LF line endings.
#
# Windows .bat files are known to have multiple bugs when run with LF
# endings, and so they are checked in with CRLF endings, with a test
# in test/winbatch.go to catch problems. (See golang.org/issue/37791.)
#
# We'll prevent accidental CRLF line endings from entering the repo
# via the git-codereview gofmt checks and tests.
#

  @SuppressWarnings("unchecked") // empty Object[] as E[]
  public static <E extends @Nullable Object> MinimalSet<E> of(E... contents) {
    return ofClassAndContents(Object.class, (E[]) new Object[0], asList(contents));
  }

  @SuppressWarnings("unchecked") // empty Object[] as E[]

  @SuppressWarnings("unchecked") // empty Object[] as E[]
  public static <E extends @Nullable Object> MinimalSet<E> of(E... contents) {
    return ofClassAndContents(Object.class, (E[]) new Object[0], asList(contents));
  }

  @SuppressWarnings("unchecked") // empty Object[] as E[]

ction(){return c}}}function e(b){var c=b.find("[data-validation-if-checked]");c.length&&a.formUtils.warn('Detected use of attribute "data-validation-if-checked" which is deprecated. Use "data-validation-depends-on" provided by module "logic"'),c.on("beforeValidation",function(){var c=a(this),d=c.valAttr("if-checked"),e=a('input[name="'+d+'"]',b),f=e.is(":checked"),g=(a.formUtils.getValue(e)||"").toString(),h=c.valAttr("if-checked-value");(!f||h&&h!==g)&&c.valAttr("skipped",!0)})}function f(b){var...

## 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")

/** Implementation of an {@link Optional} not containing a reference. */
@GwtCompatible
final class Absent<T> extends Optional<T> {
  static final Absent<Object> INSTANCE = new Absent<>();

  @SuppressWarnings("unchecked") // implementation is "fully variant"
  static <T> Optional<T> withType() {
    return (Optional<T>) INSTANCE;
  }

  private Absent() {}

  @Override
  public boolean isPresent() {
    return false;
  }