[swift-users] Protocol composition results in EXC_BAD_ACCESS

[Rudolf Adamkovič]

Because it’s a value and has no identity.

R+

> On 3 Apr 2017, at 17:58, Zhao Xin <owenzx at gmail.com> wrote:
> 
> Why not making State as a class? EffectiveState should be subclass of State.
> 
> Zhaoxin
> 
> On Mon, Apr 3, 2017 at 11:08 PM, Rudolf Adamkovič via swift-users <swift-users at swift.org <mailto:swift-users at swift.org>> wrote:
>> On 3 Apr 2017, at 16:48, Adrian Zubarev <adrian.zubarev at devandartist.com <mailto:adrian.zubarev at devandartist.com>> wrote:
>> 
>> Why do you cast against an existential in first place?
> 
> To avoid force-unwrap at the end here:
> 
> class Store {
> 
>     var state: State
> 
>     // ...
> 
>     func processScheduledActions() {
> 
>         guard var effectfulState = state as? Effectful else {
>             return
>         }
> 
>         while let actions = effectfulState.scheduledActions.flush() {
>             for action in actions {
>                 delegate?.store(self, didRequest: action)
>             }
>         }
> 
>         state = effectfulState as! State
>         
>     }
> 
> }
> 
> Thank you!
> 
> R+
> 
> 
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> 

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