*     very rare. Note that if backward conversion is not only unimplemented but
   *     unimplement<i>able</i> (for example, consider a {@code Converter<Chicken, ChickenNugget>}),
   *     then this is not logically a {@code Converter} at all, and should just implement {@link
   *     Function}.
   */
  @ForOverride
  protected abstract A doBackward(B b);

   *     very rare. Note that if backward conversion is not only unimplemented but
   *     unimplement<i>able</i> (for example, consider a {@code Converter<Chicken, ChickenNugget>}),
   *     then this is not logically a {@code Converter} at all, and should just implement {@link
   *     Function}.
   */
  @ForOverride
  protected abstract A doBackward(B b);

    return absl::OkStatus();
  }

  absl::Status RegisterFunction(AbstractFunction* func) override {
    return errors::Unimplemented(
        "Registering graph functions has not been implemented yet.");
  }

  absl::Status RemoveFunction(const string& func) override {
    return errors::Unimplemented(
        "GraphContext::RemoveFunction has not been implemented yet.");
  }
  // For LLVM style RTTI.

   * has not added {@link AnnotatedType}. That means that we cannot implement that interface in
   * source code in a way that will compile on both Java and Android. If we include the {@code
   * getAnnotatedBounds()} method, then its return type means it won't compile on Android, while if
   * we don't include the method, then the compiler will complain that an abstract method is

        assertNotNull(closeRequest, "Smb2CloseRequest should implement RequestWithFileId");
        assertNotNull(queryInfoRequest, "Smb2QueryInfoRequest should implement RequestWithFileId");
        assertNotNull(setInfoRequest, "Smb2SetInfoRequest should implement RequestWithFileId");
        assertNotNull(queryDirRequest, "Smb2QueryDirectoryRequest should implement RequestWithFileId");

    }
    return errors::Unimplemented("No custom device pinning implementation.");
  }

 private:
  TFE_Context* context_;
  TFE_CustomDevice device_;
  void* info_;
  string name_;
};

// An adapter which wraps the shape/data produced by C custom devices and uses
// it to implement custom device methods.
class CAPICustomDeviceTensorHandle

- [ ] Define lease state constants (SMB2_LEASE_READ, SMB2_LEASE_HANDLE, SMB2_LEASE_WRITE)
- [ ] Implement lease key generation and management
- [ ] Add lease context to Create request/response
- [ ] Implement lease break notification handling
- [ ] Modify SmbFile to support lease-based caching
- [ ] Add lease upgrade/downgrade logic
- [ ] Implement lease epoch tracking for v2 leases

#### 1.3 Integration Points

### Créer une dépendance, ou « dependable » { #create-a-dependency-or-dependable }

Concentrons-nous d’abord sur la dépendance.

C’est simplement une fonction qui peut prendre tous les mêmes paramètres qu’une fonction de chemin d’accès peut prendre :

{* ../../docs_src/dependencies/tutorial001_an_py310.py hl[8:9] *}

C’est tout.

**2 lignes**.

    @Test
    @DisplayName("EmptyIterator should implement CloseableIterator interface")
    void testInterfaceImplementation() {
        // Then
        assertTrue(emptyIterator instanceof CloseableIterator, "Should implement CloseableIterator");
        assertTrue(emptyIterator instanceof Iterator, "Should implement Iterator");
        assertTrue(emptyIterator instanceof AutoCloseable, "Should implement AutoCloseable");
    }

    @Test

Mais `OAuth2PasswordRequestForm` est simplement une dépendance de classe que vous auriez pu écrire vous‑même, ou vous auriez pu déclarer des paramètres `Form` directement.

Mais comme c'est un cas d'usage courant, elle est fournie directement par **FastAPI**, simplement pour vous faciliter la vie.

///

### Utiliser les données du formulaire { #use-the-form-data }