void testFromUNIBytesWithOffset() {
            // Given
            String prefix = "PREFIX";
            String target = "TARGET";
            String combined = prefix + target;
            byte[] combinedBytes = combined.getBytes(StandardCharsets.UTF_16LE);
            int prefixBytes = prefix.getBytes(StandardCharsets.UTF_16LE).length;

    const char* child_scope_name;
    if (prefix == nullptr) {
      child_scope_name = "gradients";
    } else {
      prefix_cmp = string(prefix) + "/";
      // The operation should fail if the provided name prefix has already been
      // used in this graph
      for (const auto& pair : g->name_map) {
        const string& name = pair.first;
        if ((name == prefix) || absl::StartsWith(name, prefix_cmp)) {

        regQ(fuzzyQuery);
        return fuzzyQuery;
    }

    protected PrefixQueryBuilder regPrefixQ(String name, String prefix) {
        checkEsInvalidQuery(name, prefix);
        PrefixQueryBuilder prefixQuery = QueryBuilders.prefixQuery(name, prefix);
        regQ(prefixQuery);
        return prefixQuery;
    }

    protected RangeQueryBuilder regRangeQ(String name, ConditionKey ck, Object value) {

			Description: `comma separated list of etcd endpoints` + defaultHelpPostfix(Endpoints),
			Type:        "csv",
			Sensitive:   true,
		},
		config.HelpKV{
			Key:         PathPrefix,
			Description: `namespace prefix to isolate tenants` + defaultHelpPostfix(PathPrefix),
			Optional:    true,
			Type:        "path",
		},
		config.HelpKV{
			Key:         CoreDNSPath,

			var first [17]int
			rng := rand.New(rand.NewSource(0))
			var tmp [16]byte
			rng.Read(tmp[:])
			prefix := hex.EncodeToString(tmp[:])
			for range 10000 {
				rng.Read(tmp[:])

				y := hashOrder(fmt.Sprintf("%s/%x", prefix, hex.EncodeToString(tmp[:3])), x)
				first[y[0]]++
			}
			t.Log("first:", first[:x])
		})
	}

这将花费几微秒时间，并且只会在启动时发生。

因此，它不会影响性能。⚡

///

### 包含一个有自定义 `prefix`、`tags`、`responses` 和 `dependencies` 的 `APIRouter` { #include-an-apirouter-with-a-custom-prefix-tags-responses-and-dependencies }

现在，假设你的组织为你提供了 `app/internal/admin.py` 文件。

它包含一个带有一些由你的组织在多个项目之间共享的管理员*路径操作*的 `APIRouter`。

对于此示例，它将非常简单。但是假设由于它是与组织中的其他项目所共享的，因此我们无法对其进行修改，以及直接在 `APIRouter` 中添加 `prefix`、`dependencies`、`tags` 等：

```
KEY:
etcd  federate multiple clusters for IAM and Bucket DNS

ARGS:
endpoints*       (csv)       comma separated list of etcd endpoints e.g. "http://localhost:2379"
path_prefix      (path)      namespace prefix to isolate tenants e.g. "customer1/"
coredns_path     (path)      shared bucket DNS records, default is "/skydns"
client_cert      (path)      client cert for mTLS authentication

            SystemHelper mockSystemHelper = new SystemHelper() {
                @Override
                public File createTempFile(String prefix, String suffix) {
                    try {
                        return File.createTempFile(prefix, suffix);
                    } catch (Exception e) {
                        throw new RuntimeException(e);
                    }
                }
            };

// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package cmd

// isDirEmpty - returns true if there is no error and no object and prefix inside this directory
func isDirEmpty(dirname string, _ bool) bool {
	entries, err := readDirN(dirname, 1)
	if err != nil {
		return false
	}
	return len(entries) == 0

  status->status = absl::OkStatus();
}

void TFE_SetLogicalCpuDevices(TFE_Context* ctx, int num_cpus,
                              const char* prefix, TF_Status* status) {
  std::vector<std::unique_ptr<tensorflow::Device>> devices;

  if (prefix == nullptr || strlen(prefix) == 0)
    prefix = "/job:localhost/replica:0/task:0";

  tensorflow::SessionOptions sess_options;
  (*sess_options.config.mutable_device_count())["CPU"] = num_cpus;