[swift-users] Helping the type checker

[Daniel Müllenborn via swift-users]

I have recently used the "-warn-long-function-bodies" flag, and have luckily 
only one place in my code where I should give the compiler a better hint. At 
Swift 4 it looks a bit different, but I prefer to wait before I make any 
unnecessary changes.

The code is as follows:

  subscript(path: IndexPath) -> ViewModel.SubField {
get {
  return 
ViewModel.connectors[path[0]][path[1]].connector.subFields[path[2]][path[3]]
}
set {
  ViewModel.connectors[path[0]][path[1]].subFields[path[2]][path[3]] = 
newValue
}
  }


I made it:

  subscript(path: IndexPath) -> ViewModel.SubField {
get {
  let connector = ViewModel.connectors[path[0]][path[1]]
  return connector.subFields[path[2]][path[3]]
}
set {
  ViewModel.connectors[path[0]][path[1]].subFields[path[2]][path[3]] = 
newValue
}
  }

And the warning for the get disappears, but I do not know what to do with set 
part.
The 1.4 seconds it takes, now bother me where I know it.

For a better understanding, the types look like this.

enum ViewModel {
  
  struct Connector {
var subFields: [[SubField]] = []
  }
  
  static var connectors: [[ViewModel.Connector]] = []
  
  struct SubField: Hashable {}
  
}

Has anyone a solution for me?

Regards,
Daniel
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Re: [swift-users] QualityOfService for concurrentPerform in Swift 3

[Daniel Müllenborn via swift-users]

I do not understand why this works, but when you create a queue in the line 
before. It will be used.

Like in this example:

let queue = DispatchQueue.global(qos: .default)
DispatchQueue.concurrentPerform(iterations: n)



> Hmm, I didn’t realize that concurrentPerform doesn’t allow you to pass in 
> your own queue…this looks like an oversight to me. Maybe someone with more 
> experience with libdispatch could explain?
> 
> Saagar Jha
> 
> 
> 
> > On Sep 25, 2016, at 09:13, Gerriet M. 
> > Denkmannwrote:
> > 
> > > On 25 Sep 2016, at 23:08, Saagar 
> > > Jhawrote:
> > > 
> > > You might be looking for the DispatchQoS.QoSClass enum.
> > > 
> > > Saagar Jha
> > 
> > Probably. But how to make concurrentPerform use any of these enums?
> > 
> > Gerriet.
> > 
> > 
> > 
> > > 
> > > > On Sep 25, 2016, at 05:19, Gerriet M. Denkmann via 
> > > > swift-userswrote:
> > > > 
> > > > In ObjC:
> > > > 
> > > > dispatch_queue_t queue = dispatch_get_global_queue( 
> > > > DISPATCH_QUEUE_PRIORITY_HIGH, 0 );
> > > > dispatch_apply( nbrThreads, queue, ^void(size_t idx) …
> > > > 
> > > > In Swift 3:
> > > > DispatchQueue.concurrentPerform( iterations: nbrThreads) …
> > > > 
> > > > How can one specify the DISPATCH_QUEUE_PRIORITY or QualityOfService to 
> > > > be used by concurrentPerform?
> > > > 
> > > > Gerriet.
> > > > 
> > > > ___
> > > > swift-users mailing list
> > > > swift-users@swift.org(mailto:swift-users@swift.org)
> > > > https://lists.swift.org/mailman/listinfo/swift-users
> > > 
> > 
> 
> 
> 
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