I begin to think it is related to how you `popFirst()` implemented. Check
it or post it here.
Zhao Xin
On Thu, Sep 14, 2017 at 9:36 AM, Roderick Mann <rm...@latencyzero.com>
wrote:
> Yeah, that's not it. I made the change you suggested, I get the same error.
>
> > On Sep 13, 2017, at 18:11 , Zhao Xin <owe...@gmail.com> wrote:
> >
> > Change `self` to `ModelFetcher`. You are calling a class static
> property, not a class instance property.
> >
> > Zhao Xin
> >
> > On Thu, Sep 14, 2017 at 8:37 AM, Rick Mann via swift-users <
> swift-users@swift.org> wrote:
> > Moving to Swift 4, I'm running into an issue for which I can't seem to
> find an answer in google:
> >
> > "Cannot use mutating member on immutable value: 'self' is immutable"
> >
> > The code looks like:
> >
> > class
> > ModelFetcher : NSObject, URLSessionDelegate
> > {
> > ...
> > static let managerDispatchQueue =
> DispatchQueue(label: "Model Download Manager Queue")
> > static var pendingFetchers =
> [ModelFetcher]()
> > static var currentFetcher: ModelFetcher?
> >
> > class
> > func
> > startNextFetcher()
> > {
> > self.managerDispatchQueue.async
> > {
> > guard
> > self.currentFetcher == nil,
> > let mf = self.pendingFetchers.popFirst()
> > ~~~~ ^ error:
> cannot use mutating member on immutable value: 'self' is immutable
> > else
> > {
> > return
> > }
> >
> > self.currentFetcher = mf
> > mf.start()
> > }
> > }
> > ...
> > }
> >
> > This code compiled fine in Xcode 8, or in Xcode 9/Swift 3.2 as a
> monolithic app (the error shows up when this code is factored into a
> framework). Other mutating references to self seem to compile okay (e.g.
> "self.currentFetcher = nil" or "self.pendingFetchers.remove(at: idx)").
> Not sure what's special about this one.
> >
> >
> > --
> > Rick Mann
> > rm...@latencyzero.com
> >
> >
> > _______________________________________________
> > swift-users mailing list
> > swift-users@swift.org
> > https://lists.swift.org/mailman/listinfo/swift-users
> >
>
>
> --
> Rick Mann
> rm...@latencyzero.com
>
>
>
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