[swift-evolution] [Review] SE-0148 Generic Subscripts

[Radosław Pietruszewski]

I’m +1 for the proposal.

Context, in case it’s useful for anyone: My particular use case for generic subscripts is with my SwiftyUserDefaults library (https://github.com/radex/SwiftyUserDefaults <https://github.com/radex/SwiftyUserDefaults>), which allows users to access user defaults with a syntax like: `Defaults[.foo]` and `Defaults[.foo] = 20`, in a type-safe way. `.foo` refers to a `DefaultsKey<T>` object, where T is the type stored in the user defaults. Right now, I’m forced to define multiple subscripts to support the standard types of user defaults, but it takes a lot of boilerplate code. Generic subscripts would abstract this away (with a help of a protocol to mark which types are supported). There’s also no good way to allow nested types like `[String]` or `[String: [Int]]`.

Best,
— Radek

> On 19 Jan 2017, at 22:39, Douglas Gregor via swift-evolution <swift-evolution at swift.org> wrote:
> 
> Hello Swift community,
> 
> The review of SE-0148 “Generic Subscripts" begins now and runs through January 24, 2017. The proposal is available here:
> 
> https://github.com/apple/swift-evolution/blob/master/proposals/0148-generic-subscripts.md <https://github.com/apple/swift-evolution/blob/master/proposals/NNNN-proposal.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/0148-generic-subscripts.md <https://github.com/apple/swift-evolution/blob/master/proposals/NNNN-proposal.md>
> Reply text
> 
> Other replies
>  <https://github.com/apple/swift-evolution#what-goes-into-a-review-1>What goes into a review?
> 
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> 
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> 
> -Doug
> 
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