A closure that takes an Unsafe parameter. If body has a return value, that value is also used as the return value for the with function.
あるクロージャ、それはUnsafeバラメータを取ります。bodyが戻り値を持つならば、その値はまたwith関数の戻り値としても使われます。
Generic Functionwith
withUnsafeCurrentTask(body:)
Calls a closure with an unsafe reference to the current task.
Availability
- iOS 13.0+
- iPadOS 13.0+
- macOS 10.15+
- Mac Catalyst 15.0+
- tvOS 13.0+
- watchOS 6.0+
- Xcode 13.0+
Technology
- Swift Standard Library Swift標準ライブラリ
Declaration 宣言
func withUnsafeCurrentTask<T>(body: (UnsafeCurrentTask ?) throws -> T) rethrows -> TParameters パラメータ
bodyCurrent Task Unsafe Current Task(body:) Current Task Unsafe Current Task(body:)
Return Value 戻り値
The return value, if any, of the body closure.
bodyクロージャの、もしあれば、戻り値。
Discussion 解説
If you call this function from the body of an asynchronous function, the unsafe task handle passed to the closure is always non-nil because an asynchronous function always runs in the context of a task. However, if you call this function from the body of a synchronous function, and that function isn’t executing in the context of any task, the unsafe task handle is nil.
Don’t store an unsafe task reference for use outside this method’s closure. Storing an unsafe reference doesn’t affect the task’s actual life cycle, and the behavior of accessing an unsafe task reference outside of the with method’s closure isn’t defined. Instead, use the task property of Unsafe to access an instance of Task that you can store long-term and interact with outside of the closure body.
代わりに、Unsafeのtaskプロパティを使うことで、あなたが長期間格納することそしてクロージャ本体の外側で相互作用することが可能なTaskのインスタンスにアクセスしてください。