[swift-evolution] [Review] SE-0018 Flexible Memberwise Initialization

Dave Abrahams dabrahams at apple.com
Wed Jan 6 18:04:41 CST 2016

> On Jan 6, 2016, at 2:47 PM, Chris Lattner via swift-evolution <swift-evolution at swift.org> wrote:
> Hello Swift community,
> The review of "Flexible Memberwise Initialization" begins now and runs through January 10th. The proposal is available here:
> 	https://github.com/apple/swift-evolution/blob/master/proposals/0018-flexible-memberwise-initialization.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
> or, if you would like to keep your feedback private, directly to the review manager.
> 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?

It’s okay.

> 	* Is the problem being addressed significant enough to warrant a change to Swift?

I’m lukewarm about that.  I have never found writing out the initializers I want to be a significant burden, and I find my code is better when they’re explicit.  Every new feature increases the language's complexity and surface area, and I fear this one is not going to pay its way.

> 	* Does this proposal fit well with the feel and direction of Swift?

Yes, but I worry that it may be too early to add it.  Other features in this space, like truly generic variadics, may well obsolete anything we do today.  I’m not sure we should be designing convenience features that are likely to overlap with more general features coming down the road unless the inconvenience is very painful… which I personally don’t find it to be.

> 	* If you have you used other languages or libraries with a similar feature, how do you feel that this proposal compares to those?

The proposal is more elegant than how you’d do this in Python, but on the other hand the mechanisms you’d use in Python are not single-purpose language features directed at memberwise initialization; they definitely pay their way because they can be used for much more.

> 	* How much effort did you put into your review? A glance, a quick reading, or an in-depth study?

A glance, admittedly.

> More information about the Swift evolution process is available at
> 	https://github.com/apple/swift-evolution/blob/master/process.md
> Thank you,
> -Chris
> Review Manager
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