[swift-evolution] [Review] SE-0191: Eliminate IndexDistance from Collection

Daniel Vollmer lists at maven.de
Tue Nov 28 02:37:30 CST 2017

Hi list,

> On 28. Nov 2017, at 02:34, Douglas Gregor via swift-evolution <swift-evolution at swift.org> wrote:
> The review of SE-0191 "Eliminate IndexDistance from Collection" begins now and runs through December 3, 2017. The proposal is available here:
> 	• What is your evaluation of the proposal?


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

Yes, the motivation of “less difficulty of programming against generic collections” is good enough.

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

I feel it does. Things shouldn’t be generic “just because we can”. Swift has made a fairly firm recommendation on integer sizes and signedness, and that should continue into index distances in collections.

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

C++ often has a difference_type in its containers, but hardly anyone uses that correctly (size_t vs difference_type).

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

Quick glance.


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