[swift-users] @escaping may only be applied to parameters of function type

Shawn Erickson shawnce at gmail.com
Tue Sep 13 21:31:12 CDT 2016

I hit this issue as well. I had an early email on this list regarding do
this topic, not in a situation to search for it. It is a short coming in
how escaping can be applied to things like optional closures.

I was in the process of authoring an email for swift evolution about it and
haven't yet gotten around to filing a defect about it.

On Tue, Sep 13, 2016 at 7:27 PM Rick Mann via swift-users <
swift-users at swift.org> wrote:

> I'm trying to write this function. The errorHandler: parameter is modeled
> after the NSFileManager enumerate() function. If I include the @escaping
> you see there, I get the error "@escaping may only be applied to parameters
> of function type".
> The second parameter, iterator:, seems to have no problems with @escaping.
> func
> iterate(directory inURL: URL?,
>         includingPropertiesForKeys: [URLResourceKey]? = nil,
>         options: FileManager.DirectoryEnumerationOptions = [],
>         errorHandler inErrorHandler: (@escaping (URL, Error) -> Bool)? =
> nil,
>         iterator inIterator: (@escaping (URL) throws -> ())) rethrows
> {
> }
> I'm not sure why I can't apply @escaping here. Can anyone enlighten me?
> Thank you.
> --
> Rick Mann
> rmann at latencyzero.com
> _______________________________________________
> swift-users mailing list
> swift-users at swift.org
> https://lists.swift.org/mailman/listinfo/swift-users
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