Swift: how to wrap `completion` into an async/await?-CodePudding

I have a callback based API.

func start(_ completion: @escaping () -> Void)

I'd like to write an async/await wrapper on top of that API, deferring the implementation to original callback based API.

func start() async {
    let task = Task()
    start { 
        task.fulfill()
    }
    
    return await task
}

Obviously, this code doesn't connect - it's not real, there is no method fulfill on Task.

Question: is there a way to use unstructured concurrency in Swift so that it would help me achieve this?

CodePudding user response：

You are looking for continuations.

Here is how to use it in your example:

func start() async {
    await withCheckedContinuation { continuation in
        start(continuation.resume)
    }
}