[swift-evolution] Handling unknown cases in enums [RE: SE-0192]
clattner at nondot.org
Wed Jan 10 00:10:23 CST 2018
On Jan 9, 2018, at 3:07 PM, Jose Cheyo Jimenez <cheyo at masters3d.com> wrote:
> Hi Chris,
> This is great. Thanks for spending time on this! I am in favor of `case #unknown` to only match unknown cases.
> 1) Would #uknown be available to RawRepresentable structs?
I haven’t considered this, so I’m not sure how that would work. I had assumed that this would be an enum specific concept.
What do you have in mind? If your raw representation is itself an enum, then of course this would work.
> 2) How is the #uknown pattern accomplished? Are you suggesting to capture all the compile time known cases so you can do a diff during
> runtime? (Sorry this is not obvious to me)
The internals of the compiler would handle this, it is difficult to explain unless you know the bowels of silgen and irgen :-)
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