[swift-evolution] [Proposal][Discussion] Deprecate Tuple Shuffles

[Xiaodi Wu]

On Fri, May 5, 2017 at 12:52 AM, Adrian Zubarev <
adrian.zubarev at devandartist.com> wrote:

> Eliminating all labels would mean that even the first example from my last
> post will be banned.
>
No, not eliminating all labels from tuples, but from tuple _patterns_.


> Is there any difference from labels in tuple types and labels in tuples
> themselves?
>
> Personally I would not support the removal of labels from tuple types,
> because it’s a very useful feature that replaces indexed access like
> myTuple.1 to a more readable counterpart myTuple.somethingSpecial.
>
> Am I still missing something out?
>
>
>
> --
> Adrian Zubarev
> Sent with Airmail
>
> Am 5. Mai 2017 um 07:43:49, Xiaodi Wu (xiaodi.wu at gmail.com) schrieb:
>
> On Fri, May 5, 2017 at 12:42 AM, Adrian Zubarev via swift-evolution <
> swift-evolution at swift.org> wrote:
>
>> Okay now I see where this is going. So basically you want to mirror the
>> behavior of function parameters into tuples.
>>
>> You might want to be a little bit more explicit on types in your proposal
>> to better understand the so called ‘tuple shuffle’.
>>
>> let a: (x: Int, y: Int) = (x: 1, y: 2)
>> var b: (y: Int, x: Int) = a
>> a.x == b.x
>> a.y == b.y
>>
>> Label swap (tuple shuffle) while destructuring:
>>
>> let tuple: (first: Int, second: (x: Int, y: Int)) = (first: 0, second: (x: 1, y: 2))
>>
>> let (first: a, second: (x: b, y: c)): (first: Int, second: (x: Int, y: Int)) = tuple // fine, unaffected
>>
>> let (second: (x: b, y: c), first: a): (second: (x: Int, y: Int), first: Int) = tuple // shuffle => error
>>
>>
> No, I thought this was what Robert was proposing, but he is proposing the
> elimination of all labels in tuple patterns. Your second example would be
> banned.
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.swift.org/pipermail/swift-evolution/attachments/20170505/383bcd8d/attachment.html>