[swift-evolution] [swift-evolution-announce] [Review] SE-0173: Add `MutableCollection.swap(_:with:)

[John McCall]

> On Apr 26, 2017, at 6:36 PM, Xiaodi Wu via swift-evolution <swift-evolution at swift.org> wrote:
> 
> On Wed, Apr 26, 2017 at 4:06 PM, Howard Lovatt via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> wrote:
> review of SE-0173 "Add MutableCollection.swap(_:with:)" 
> 
> What is your evaluation of the proposal?
> Good idea. Reads better than current global swap. 
> Is the problem being addressed significant enough to warrant a change to Swift?
> Probably; It will become significant once control over ARC added, though not needed just yet. 
> Does this proposal fit well with the feel and direction of Swift?
> Yes. The global functions do not sit well with Swift. Methods read much better. Could just eliminate current swap and not replace it though. You can write `(a[i], a[j]) = (a[j], a[i])` instead. 
> 
> Source compatibility is a serious goal now. There's no harm in the current `swap`, and I use it. This is no rationale for breaking existing code.

There are also performance — and, under ownership, eventually semantic — benefits to using swap over the tuple-assignment idiom.

John.

> If you have used other languages or libraries with a similar feature, how do you feel that this proposal compares to those?
> Yes. People write similar functions in Java, though not in standard library. 
> How much effort did you put into your review? A glance, a quick reading, or an in-depth study?
> Quick read
> 
> 
> -- Howard. 
> 
> On 26 Apr 2017, at 4:32 am, Ted Kremenek <kremenek at apple.com <mailto:kremenek at apple.com>> wrote:
> 
>> review of SE-0173 "Add MutableCollection.swap(_:with:)" begins now and runs through April 28, 2017.
>> 
>> The proposal is available here:
>> 
>> https://github.com/apple/swift-evolution/blob/master/proposals/0173-swap-indices.md <https://github.com/apple/swift-evolution/blob/master/proposals/0173-swap-indices.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/0173-swap-indices.md <https://github.com/apple/swift-evolution/blob/master/proposals/0173-swap-indices.md>
>> Reply text
>> 
>> Other replies
>> What goes into a review?
>> 
>> The goal of the review process is to improve the proposal under review through constructive criticism and, eventually, determine the direction of Swift. When writing your review, here are some questions you might want to answer in your review:
>> 
>> What is your evaluation of the proposal?
>> Is the problem being addressed significant enough to warrant a change to Swift?
>> Does this proposal fit well with the feel and direction of Swift?
>> If you have used other languages or libraries with a similar feature, how do you feel that this proposal compares to those?
>> How much effort did you put into your review? A glance, a quick reading, or an in-depth study?
>> M
>> 
> 
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