[swift-evolution] [Proposal] Enum subsets

Austin Zheng austinzheng at gmail.com
Sat Jun 4 00:34:13 CDT 2016

It seems like it would make sense to model enum subsets as a subtype relationship.

Is the core team planning on drawing up a structs/enums subtyping proposal later this year?


> On Jun 3, 2016, at 10:25 PM, Chris Lattner <clattner at apple.com> wrote:
>> On Jun 3, 2016, at 2:35 PM, T.J. Usiyan via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> wrote:
>> Since this seems to have some interest, I've made a gist.
>> https://gist.github.com/griotspeak/963bc87a0c244c120264b11fb022d78c <https://gist.github.com/griotspeak/963bc87a0c244c120264b11fb022d78c>
> We have frequently discussed introducing subtype relationships between structs and enums, in an effort to allow limited implicit promotions (e.g. from small integers to wider integers).  Wouldn’t that be a more general solution to this same problem?
> -Chris

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