[swift-evolution] Proposal: Contiguous Variables (A.K.A. Fixed Sized Array Type)

Félix Cloutier felixcca at yahoo.ca
Fri Jan 29 12:00:54 CST 2016

> Le 29 janv. 2016 à 00:50:52, Chris Lattner <clattner at apple.com> a écrit :
>> On Jan 28, 2016, at 9:41 PM, Félix Cloutier <felixcca at yahoo.ca> wrote:
>> I think that (4 x Int) needs to be syntax sugar for (Int, Int, Int, Int). Not having them the same would introduce awkward cases into the language.
> Agreed.  This means that:
>   let values: (4 x Int)(repeatedValue: 0) // Is this possible?
> will not be possible.

Why will it be possible to add a subscript but not an initializer?

>> Because of that, I also think that forcing people to use the subscript would have some awkward consequences. What if I have a func<T, U> that uses a (T, U) tuple and both T and U happen to be the same type?
> I don’t understand this concern.

If direct element access is disallowed on homogeneous tuples, to me, it would look like a bug that you can use direct element access on a (T, U) tuple from a generic function with <T, U> parameters, but not anywhere else. But regardless, we seem to agree that homogeneous tuples shouldn't lose direct member access.


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