[swift-evolution] [Proposal] Allow enumerating cases in enumerations

[James Campbell]

Maybe a way we could opt in is by only doing this for enums with out
turples?

i.e

enum ABTestingBrah {

case A
case B

}

I'm not sure if enums that take turples would need this functionality.

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On 5 July 2016 at 11:39, Charlie Monroe <charlie at charliemonroe.net> wrote:

> Example:
>
> enum MediaKind {
> case HomeVideo, Movie, MusicVideo, TVShow
>
> var localizedName: String { ... }
> }
>
> let popUpButton: NSPopUpButton = ...
> for kind in MediaKind.allKinds {
> popUpButton.addItemWithTitle(kind.localizedName)
> }
>
> And many, many more.
>
>
> On Jul 5, 2016, at 12:33 PM, James Campbell via swift-evolution <
> swift-evolution at swift.org> wrote:
>
> Would love a real life scenario of why you would need this.
>
> *___________________________________*
>
> *James⎥Head of Trolls*
>
> *james at supmenow.com <james at supmenow.com>⎥supmenow.com
> <http://supmenow.com/>*
>
> *Sup*
>
> *Runway East *
>
> *10 Finsbury Square*
>
> *London*
>
> * EC2A 1AF *
>
> On 4 July 2016 at 02:36, Gabriel Lanata via swift-evolution <
> swift-evolution at swift.org> wrote:
>
>> Hello, this has been proposed multiple times before in different ways.
>>
>> Link to detailed proposal draft:
>>
>> https://github.com/gabriellanata/swift-evolution/blob/master/proposals/NNNN-allow-enumerating-cases-in-enumerations.md
>>
>> It is currently not possible to enumerate through all the possible cases
>> of an enumeration object without adding a hardcoded value or recurring to
>> unsafe workarounds. The proposal is to add a method of obtaining an array
>> or set of all the possible cases natively for enumerations without
>> associated values.
>>
>> The proposed solution is to implement a native `.cases` static var for
>> all enumerations without associated values. This would provide a strict
>> type-safe way of enumerating though the possible cases without risking
>> runtime errors. The resulting code is a lot cleaner and less prone to
>> errors caused by forgetting to update the hardcoded values when
>> modifying cases.
>>
>> Resulting code:
>>
>>    enum PokemonType {
>>        case Fire, Grass, Water, Wind
>>    }
>>    for pokemonType in PokemonType.cases {
>>        // Do stuff
>>    }
>>    PokemonType.cases.count // Returns 4
>>
>>
>> -------
>> Gabriel
>>
>>
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>> swift-evolution at swift.org
>> https://lists.swift.org/mailman/listinfo/swift-evolution
>>
>>
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