[swift-users] Is there any harm that an @escaping handler never called?

Zhao Xin owenzx at gmail.com
Tue Jul 11 20:03:09 CDT 2017


Glad to know the answer. And thank you, Slava and Daniel.‚Äč

Zhao Xin

On Wed, Jul 12, 2017 at 7:53 AM, Daniel Dunbar <daniel_dunbar at apple.com>
wrote:

>
> On Jul 11, 2017, at 3:55 PM, Zhao Xin via swift-users <
> swift-users at swift.org> wrote:
>
> For example, I have an async query, I pass it an `@escaping
> resultHandler`. If there is any results, the handler will run. However, if
> the result is empty, the `@escaping resultHandler` will never run.
>
> Is there any memory leak or something will happen if the `@escaping
> resultHandler` never runs?
>
>
> No, assuming your handler has been written to not participate in a retain
> cycle (for example, ensuring you use [weak self] if appropriate).
>
>  - Daniel
>
> Zhao Xin
> _______________________________________________
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> swift-users at swift.org
> https://lists.swift.org/mailman/listinfo/swift-users
>
>
>
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