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

[Shawn Erickson]

The following is the earlier thread I was talking about.

[swift-users] Swift 3 (Xcode 8 GM) issue with @escaping
<https://lists.swift.org/pipermail/swift-users/Week-of-Mon-20160905/003179.html>

-Shawn

On Tue, Sep 13, 2016 at 7:31 PM Shawn Erickson <shawnce at gmail.com> wrote:

> 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.
>
> -Shawn
> 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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