In what cases in Swift language is it necessary to use the @escaping annotation for closures?

In Swift, the @escaping annotation is used for closures that may be called after the function they were passed to has returned. This is necessary when the closure is stored for later use, such as in asynchronous operations or when stored in properties.

Example where @escaping is needed:

func performAsyncTask(completion: @escaping () -> Void) {
    DispatchQueue.global().async {
        // Asynchronous work
        completion() // call the closure after the function exits
    }
}

If the closure is called within the function before it returns, @escaping is not required. But if the closure is stored or called later, the compiler enforces @escaping.

This relates to managing the closure's lifetime and preventing memory errors.