For example, given the function:
</p>

<pre>
func f[P ~float32|~float64]() {
	… P(1.1) …
}
</pre>

<p>
the conversion <code>P(1.1)</code> results in a non-constant value of type <code>P</code>
and the value <code>1.1</code> is represented as a <code>float32</code> or a <code>float64</code>
depending on the type argument for <code>f</code>.

   * https://github.com/square/okhttp/issues/4258
   */
  @Test
  @Throws(Exception::class)
  fun webSocketConnectionIsReleased() {
    // This test assumes HTTP/1.1 pooling semantics.
    client =
      client
        .newBuilder()
        .protocols(Arrays.asList(Protocol.HTTP_1_1))
        .build()
    webServer.enqueue(
      MockResponse
        .Builder()

            ByteBuffer buffer = ByteBuffer.allocate(24);
            buffer.order(ByteOrder.LITTLE_ENDIAN);
            buffer.putLong(totalBlocks);
            buffer.putLong(freeBlocks);
            buffer.putInt(1); // 1 sector per allocation unit
            buffer.putInt(4096); // 4KB sectors

            // When
            fileFsSizeInfo.decode(buffer.array(), 0, 24);

            // Then

        doAnswer(inv -> {
            int len = inv.getArgument(2);
            // First call returns len-1, second returns 1
            return calls.getAndIncrement() == 0 ? Math.max(1, len - 1) : 1;
        }).when(raf).read(any(byte[].class), anyInt(), anyInt());
        byte[] dst = new byte[4];
        assertDoesNotThrow(() -> raf.readFully(dst));
        assertEquals(2, calls.get());
    }

    @Test

Parametrenin eşleşmesi gereken bir `pattern` <dfn title="String'ler için arama deseni tanımlayan karakter dizisi">düzenli ifade</dfn> tanımlayabilirsiniz:

{* ../../docs_src/query_params_str_validations/tutorial004_an_py310.py hl[11] *}

Bu özel regular expression pattern’i, gelen parametre değerinin şunları sağladığını kontrol eder:

* `^`: Aşağıdaki karakterlerle başlar; öncesinde karakter yoktur.

   * first permutation will be in ascending order, and the last will be in descending order.
   *
   * <p>Duplicate elements are considered equal. For example, the list [1, 1] will have only one
   * permutation, instead of two. This is why the elements have to implement {@link Comparable}.
   *
   * <p>An empty iterable has only one permutation, which is an empty list.
   *

Le cas le plus courant serait [de renvoyer directement une Response comme expliqué plus loin dans la documentation avancée](../advanced/response-directly.md).

{* ../../docs_src/response_model/tutorial003_02_py310.py hl[8,10:11] *}

Ce cas simple est géré automatiquement par FastAPI car l'annotation du type de retour est la classe (ou une sous-classe de) `Response`.

## 加入正規表示式 { #add-regular-expressions }

你可以定義參數必須符合的 <dfn title="正規表示式（regex、regexp）是一組用於定義字串搜尋樣式的字元序列。">regular expression</dfn> `pattern`：

{* ../../docs_src/query_params_str_validations/tutorial004_an_py310.py hl[11] *}

這個特定的正規表示式樣式會檢查收到的參數值是否：

- `^`：以後續的字元開頭，前面不能有其他字元。
- `fixedquery`：必須正好等於 `fixedquery`。
- `$`：在此結束，`fixedquery` 後面不能再有其他字元。

如果你對「正規表示式」感到困惑，別擔心。這對很多人來說都不容易。你仍然可以先不使用正規表示式就完成很多事情。

}

// Msgsize returns an upper bound estimate of the number of bytes occupied by the serialized message
func (z *dataUsageCacheInfo) Msgsize() (s int) {
	s = 1 + 5 + msgp.StringPrefixSize + len(z.Name) + 10 + msgp.Uint32Size + 11 + msgp.TimeSize + 12 + msgp.BoolSize
	return
}

// DecodeMsg implements msgp.Decodable
func (z *dataUsageCacheV2) DecodeMsg(dc *msgp.Reader) (err error) {
	var field []byte
	_ = field
	var zb0001 uint32

    // Correct the size for open addressing to match desired load factor.
    if (setSize < CUTOFF) {
      // Round up to the next highest power of 2.
      int tableSize = Integer.highestOneBit(setSize - 1) << 1;
      while (tableSize * DESIRED_LOAD_FACTOR < setSize) {
        tableSize <<= 1;
      }
      return tableSize;
    }

    // The table can't be completely full or we'll get infinite reprobes