[swift-evolution] Rough Proposal - Collection of all cases for an Enum

Félix Cloutier felixcca at yahoo.ca
Wed Dec 23 16:46:00 CST 2015

You should join your efforts to the "Enum 'count' functionality" <https://lists.swift.org/pipermail/swift-evolution/Week-of-Mon-20151221/003819.html> thread, where this is also being discussed.


> Le 23 déc. 2015 à 17:41:13, Anthony Miller via swift-evolution <swift-evolution at swift.org> a écrit :
> Rough proposal for implementing a method to get all cases on a enum. I feel like this is a valuable feature, and all current methods of doing this have major drawbacks. I'd like to field the idea to gauge interest.
> Thank You,
> Anthony Miller
> Lead iOS Developer, App-Order.com <http://app-order.com/>
> Mobile: 702-334-8454
> # Collection of all cases for an Enum
> ## Introduction
> Add reflection capabilities for getting an `Array` or `Set` of all cases for an Enum. 
> This would not be supported for enums with associated values.
> ## Motivation
> This feature provides a benefit for many use cases. 
> Multiple methods of doing this exist currently, however each has obvious drawbacks.
> For an summary of current methods, see: http://stackoverflow.com/questions/24007461/how-to-enumerate-an-enum-with-string-type/24137319#24137319 <http://stackoverflow.com/questions/24007461/how-to-enumerate-an-enum-with-string-type/24137319#24137319>
> ## Proposed solution
> This could be implemented as a static function or static constant. 
>     enum Foo {
>         case CaseOne, CaseTwo, CaseThree
>     }
>     let allCases: [Foo] = Foo.allCases()    // [.CaseOne, .CaseTwo, .CaseThree]    
> Alternatively, an extension of `Mirror` to support mirrors of types could include this capability.
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