import javax.annotation.CheckForNull;

/**
 * Static utility methods pertaining to {@code char} primitives, that are not already found in
 * either {@link Character} or {@link Arrays}.
 *
 * <p>All the operations in this class treat {@code char} values strictly numerically; they are
 * neither Unicode-aware nor locale-dependent.
 *
 * <p>See the Guava User Guide article on <a

    return true;
  }

  private boolean canAcquire(long nowMicros, long timeoutMicros) {
    return queryEarliestAvailable(nowMicros) - timeoutMicros <= nowMicros;
  }

  /**
   * Reserves next ticket and returns the wait time that the caller must wait for.
   *
   * @return the required wait time, never negative
   */
  final long reserveAndGetWaitLength(int permits, long nowMicros) {

   * array with a nullable element type. But probably they usually want an array with a non-nullable
   * type. That said, we could *accept* a `@Nullable T[]` (which, given that we treat arrays as
   * covariant, would still permit a plain `T[]`) and return a plain `T[]`. But of course that would
   * require its own suppression, since it is also unsound. toArray(T[]) is just a mess from a

		if c.badPointerTypedef(dt) {
			// Treat this typedef as a uintptr.
			s := *sub
			s.Go = c.uintptr
			s.BadPointer = true
			sub = &s
			// Make sure we update any previously computed type.
			if oldType := typedef[name.Name]; oldType != nil {
				oldType.Go = sub.Go
				oldType.BadPointer = true
			}
		}
		if c.badVoidPointerTypedef(dt) {

		}
	case config.DriveSubSys:
		if _, err := drive.LookupConfig(s[config.DriveSubSys][config.Default]); err != nil {
			return err
		}
	case config.PolicyOPASubSys:
		// In case legacy OPA config is being set, we treat it as if the
		// AuthZPlugin is being set.
		subSys = config.PolicyPluginSubSys
		fallthrough
	case config.PolicyPluginSubSys:

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### Bước 1: import `FastAPI`

```Python hl_lines="1"
{!../../docs_src/first_steps/tutorial001.py!}
```

`FastAPI` là một Python class cung cấp tất cả chức năng cho API của bạn.

/// note | "Chi tiết kĩ thuật"

`FastAPI` là một class kế thừa trực tiếp `Starlette`.

Bạn cũng có thể sử dụng tất cả <a href="https://www.starlette.io/" class="external-link" target="_blank">Starlette</a> chức năng với `FastAPI`.

///

                }

                isDigit = false;
            }
        }

        if (version.length() > startIndex) {
            // 1.0.0.X1 < 1.0.0-X2
            // treat .X as -X for any string qualifier X
            if (!isDigit && !list.isEmpty()) {
                list.add(list = new ListItem());
                stack.push(list);
            }

         * halfSquare. (We have to deal with overflow, though.)
         *
         * If we treat halfSquare as an unsigned long, we know that
         *            sqrtFloor^2 <= x < (sqrtFloor + 1)^2
         * halfSquare - sqrtFloor <= x < halfSquare + sqrtFloor + 1
         * so |x - halfSquare| <= sqrtFloor.  Therefore, it's safe to treat x - halfSquare as a
         * signed long, so lessThanBranchFree is safe for use.
         */