[swift-evolution] [Discussion] What is the future of tuples in Swift?

[Slava Pestov]

> On Mar 2, 2017, at 3:24 AM, Anton Zhilin via swift-evolution <swift-evolution at swift.org> wrote:
> 
> I think that tuples should remain what they are now. Static-length vectors should be types on their own and interact with tuples, with structs and with Array<…> in the same way.
> 
> newtype should be what enables extension of tuples:
> 
> 
Does newtype add any new capability that’s not already covered by defining a struct?

Slava

> newtype Money = (Int, Int)
> 
> extension Money: CustomStringConvertible {
>     var description: String {
>         return String(format: "$%d.%02d", arguments: [getSelfFirst, getSelfSecond])
>     }
> }
> 
> let x = (0, 42)
> let y = x as Money  // error
> print(x.description)  // error
> 
> let z = Money(0, 42)
> print(z.description)  //=> $0.42
> Here, getSelfFirst and getSelfSecond are placeholders for some syntax to access the underlying type.
> 
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