* fact the static type of {@link Throwable} is occasionally justified even for a method with no
   * {@code throws} clause: Some such methods can in fact throw a checked exception (e.g., by
   * calling code written in Kotlin).) Typically, we want to let a {@link Throwable} from such a
   * method propagate untouched, just as we'd typically let it do for a non-reflective call.

   * fact the static type of {@link Throwable} is occasionally justified even for a method with no
   * {@code throws} clause: Some such methods can in fact throw a checked exception (e.g., by
   * calling code written in Kotlin).) Typically, we want to let a {@link Throwable} from such a
   * method propagate untouched, just as we'd typically let it do for a non-reflective call.

    }

    public static void staticOneArgCheckForNullThrowsNpe(@CheckForNull String s) {
      checkNotNull(s); // doesn't check if you said you'd accept null, but you don't
    }

    public static void staticOneArgNullableThrowsNpe(@Nullable String s) {
      checkNotNull(s); // doesn't check if you said you'd accept null, but you don't
    }

    public void oneArgCorrectlyThrowsNpe(String s) {

	// 1. Check that svc account appears in listing
	c.assertSvcAccAppearsInListing(ctx, userAdmClient, accessKey, cr.AccessKey)

	// 2. Check that svc account info can be queried
	c.assertSvcAccInfoQueryable(ctx, userAdmClient, accessKey, cr.AccessKey, false)

	// 3. Check S3 access
	c.assertSvcAccS3Access(ctx, s, cr, bucket)

	// 5. Check that service account can be deleted.

            // Validate that security buffer doesn't exceed available data
            if (hdrStart + securityBufferOffset < hdrStart || // Check for integer overflow
                    hdrStart + securityBufferOffset + securityBufferLength < 0 || // Check for integer overflow
                    hdrStart + securityBufferOffset + securityBufferLength > buffer.length) {

                                        <div class="form-check">
                                            <la:checkbox styleId="jobLogging" styleClass="form-check-input" property="jobLogging"/>
                                            <label for="jobLogging" class="form-check-label">
                                                <la:message key="labels.enabled"/>

		fmt.Println()
		f, err := os.CreateTemp("", "go_ios_detect_")
		check(err)
		fname := f.Name()
		defer os.Remove(fname)

		out := output(parseMobileProvision(mp))
		_, err = f.Write(out)
		check(err)
		check(f.Close())

		cert, err := plistExtract(fname, "DeveloperCertificates:0")
		check(err)
		pcert, err := x509.ParseCertificate(cert)
		check(err)
		fmt.Printf("export GOIOS_DEV_ID=\"%s\"\n", pcert.Subject.CommonName)

     */
    boolean verifySignature(byte[] buffer, int i, int size);

    /**
     * Checks if signature verification failed.
     *
     * @return whether signature verification failed
     */
    boolean isVerifyFailed();

    /**
     * Checks if the response indicates an error.
     *
     * @return whether the response is an error
     */
    boolean isError();

    /**

    /*
     * We can't simply cast the result of `RegularImmutableMap.get` to V because of a bug in our
     * nullness checker (resulting from https://github.com/jspecify/checker-framework/issues/8).
     */
    if (result == null) {
      return null;
    } else {
      return (V) result;
    }
  }

  @Override

{* ../../docs_src/dependencies/tutorial011_an_py310.py hl[18] *}

这样就把依赖项“参数化”了，现在它内部带有属性 `checker.fixed_content` 的值 `"bar"`。

## 把实例作为依赖项 { #use-the-instance-as-a-dependency }

然后，我们可以在 `Depends(checker)` 中使用这个 `checker`，而不是 `Depends(FixedContentQueryChecker)`，因为依赖项是实例 `checker`，不是类本身。

解析依赖项时，**FastAPI** 会像这样调用 `checker`：

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

...并将其返回值作为依赖项的值，传给我们的*路径操作函数*中的参数 `fixed_content_included`：