[swift-evolution] [Review] SE-0155: Normalize Enum Case Representation
daniel at duan.org
Sat Feb 18 14:28:49 CST 2017
> On Feb 18, 2017, at 12:30 AM, Slava Pestov via swift-evolution <swift-evolution at swift.org> wrote:
> +1, two small questions:
> - If two cases have the same base name but different full names, will matching on the base name match both cases, or will it be an error?
> - What are the memory layout optimizations described here? From a first glance this looks purely syntactic.
Nothing has stopped us from optimizing the layout further by stop using a tuple. In that sense this proposal is purely syntactic indeed. I got this idea from Joe. So I’ll just quote him here :P
“...makes it easier to allow layout optimization, since the layout of each payload would be unique to the enum instead of having to play double duty as a tuple. Since tuples are structural types and can be dynamically passed into generic contexts we're constrained by the limitations of value witness tables in laying them out; no overlapping spare bits or anything like that."
>> On Feb 17, 2017, at 7:26 PM, John McCall via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> wrote:
>> Hello Swift community,
>> The review of "SE-0155: Normalize Enum Case Representation" begins now and runs through next Friday, February 26th. The proposal is available here:
>> https://github.com/apple/swift-evolution/blob/master/proposals/0155-normalize-enum-case-representation.md <https://github.com/apple/swift-evolution/blob/master/proposals/0155-normalize-enum-case-representation.md>
>> Reviews are an important part of the Swift evolution process. All reviews should be sent to the swift-evolution mailing list at
>> https://lists.swift.org/mailman/listinfo/swift-evolution <https://lists.swift.org/mailman/listinfo/swift-evolution>
>> or, if you would like to keep your feedback private, directly to the review manager. When replying, please try to keep the proposal link at the top of the message:
>> Proposal link: https://github.com/apple/swift-evolution/blob/master/proposals/0155-normalize-enum-case-representation.md <https://github.com/apple/swift-evolution/blob/master/proposals/0155-normalize-enum-case-representation.md>
>> Reply text
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>> What goes into a review?
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>> • What is your evaluation of the proposal?
>> • Is the problem being addressed significant enough to warrant a change to Swift?
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>> More information about the Swift evolution process is available at https://github.com/apple/swift-evolution/blob/master/process.md <https://github.com/apple/swift-evolution/blob/master/process.md>
>> Thank you,
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>> Review Manager
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