assertEquals(4, stopwatch.elapsed(NANOSECONDS));
  }

  public void testElapsed_multipleSegments() {
    stopwatch.start();
    ticker.advance(9);
    stopwatch.stop();

    ticker.advance(16);

    stopwatch.start();
    assertEquals(9, stopwatch.elapsed(NANOSECONDS));
    ticker.advance(25);
    assertEquals(34, stopwatch.elapsed(NANOSECONDS));

    stopwatch.stop();
    ticker.advance(36);

    }


    public static int readInt4 ( byte[] src, int srcIndex ) {
        return ( src[ srcIndex ] & 0xFF ) + ( ( src[ srcIndex + 1 ] & 0xFF ) << 8 ) + ( ( src[ srcIndex + 2 ] & 0xFF ) << 16 )
                + ( ( src[ srcIndex + 3 ] & 0xFF ) << 24 );
    }


    public static long readInt8 ( byte[] src, int srcIndex ) {

    }


    @Override
    public void encode ( NdrBuffer buf ) throws NdrException {
        int start = buf.getIndex();
        int alloc_hint_index = 0;

        buf.advance(16); /* momentarily skip header */
        if ( this.ptype == 0 ) { /* Request */
            alloc_hint_index = buf.getIndex();
            buf.enc_ndr_long(0); /* momentarily skip alloc hint */

   * 4648 section 8</a>, Base 16 Encoding. (This is the same as the base 16 encoding from <a
   * href="http://tools.ietf.org/html/rfc3548#section-6">RFC 3548</a>.) This is commonly known as
   * "hexadecimal" format.
   *
   * <p>No padding is necessary in base 16, so {@link #withPadChar(char)} and {@link #omitPadding()}
   * have no effect.
   *

        // NAME_LEN
        if ( buf.length < i + NAME_LEN_SIZE ) {
            throw new IllegalArgumentException();
        }
        len = 0xff000000 & ( buf[ i++ ] << 24 );
        len |= 0x00ff0000 & ( buf[ i++ ] << 16 );
        len |= 0x0000ff00 & ( buf[ i++ ] << 8 );
        len |= 0x000000ff & buf[ i++ ];

        // NAME
        if ( buf.length < i + len ) {
            throw new IllegalArgumentException();
        }

接下来，使用 `__init__` 声明用于**参数化**依赖项的实例参数：

```Python hl_lines="7"
{!../../docs_src/dependencies/tutorial011.py!}
```

本例中，**FastAPI** 不使用 `__init__`，我们要直接在代码中使用。

## 创建实例

使用以下代码创建类实例：

```Python hl_lines="16"
{!../../docs_src/dependencies/tutorial011.py!}
```

这样就可以**参数化**依赖项，它包含 `checker.fixed_content` 的属性 - `"bar"`。

## 把实例作为依赖项

pkg crypto/tls, const Ed25519 = 2055
pkg crypto/tls, const Ed25519 SignatureScheme
pkg crypto/x509, const Ed25519 = 4
pkg crypto/x509, const Ed25519 PublicKeyAlgorithm
pkg crypto/x509, const PureEd25519 = 16
pkg crypto/x509, const PureEd25519 SignatureAlgorithm
pkg database/sql, method (*Conn) Raw(func(interface{}) error) error
pkg database/sql, method (*NullInt32) Scan(interface{}) error

     * @return a four byte array
     */
    public byte[] getAddress () {
        byte[] addr = new byte[4];
        addr[ 0 ] = (byte) ( ( this.address >>> 24 ) & 0xFF );
        addr[ 1 ] = (byte) ( ( this.address >>> 16 ) & 0xFF );
        addr[ 2 ] = (byte) ( ( this.address >>> 8 ) & 0xFF );
        addr[ 3 ] = (byte) ( this.address & 0xFF );
        return addr;
    }


    /**

    private static void verifyAESHMAC ( int usage, String expect, String key, byte[] bytes ) throws GeneralSecurityException {
        byte[] keybytes = Hex.decode(key);
        byte[] javaChecksum;
        if ( keybytes.length == 16 ) {
            javaChecksum = sun.security.krb5.internal.crypto.Aes128.calculateChecksum(keybytes, usage, bytes, 0, bytes.length);

        }
        else {

    putByte((byte) (s >>> 8));
    return this;
  }

  @Override
  @CanIgnoreReturnValue
  public Hasher putInt(int i) {
    putByte((byte) i);
    putByte((byte) (i >>> 8));
    putByte((byte) (i >>> 16));
    putByte((byte) (i >>> 24));
    return this;
  }

  @Override
  @CanIgnoreReturnValue
  public Hasher putLong(long l) {
    for (int i = 0; i < 64; i += 8) {
      putByte((byte) (l >>> i));