[swift-evolution] Will these two features be included in Swift 3?

[tuuranton at tutanota.de]

Actually, I just realized that your solution isn't at all what I'm after.
Doing "extension Array<Double>" is not the same thing and wouldn't be just a 
"syntactic sugar" for the code you came up with.
Why? Because in your code, the extension method only knows that the array's 
Element is a DoubleProtocol. It doesn't know it's a *Double* (which is what I 
want it to be). As such, it won't have access to Double's methods and such.
This is probably okay for Doubles, but for other types, especially my own 
custom types with their own methods, the difference is huge. "extension 
Array<MyStructType>" is what I want, but your solution won't help me if the 
extension method needs access to MyStructType's methods.
See what I mean, or am I missing something here?

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7. Dec 2015 13:14 by krzysztof at siejkowski.net:


> Concerning extension constraining, it’s already doable with:
> ```> protocol DoubleProtocol {}
> extension Double : DoubleProtocol {}
> extension Array where Element : DoubleProtocol {>     func onlyForDoubles() 
> -> String {>             return "hello doubles!">     }> }
> [1.2].onlyForDoubles() // „hello doubles!”> ["a"].onlyForDoubles() // 
> error: type of expression is ambiguous without more context> ```
> However, I personally like the idea of making a syntactic sugar for that 
> case.
> All the best,> Krzysztof>
>  >
>
> On 7 December 2015 at 13:01:11, Krzysztof Siejkowski (> 
> krzysztof at siejkowski.net> ) wrote:
>

> Concerning generic typealiases, the topic is already beingdiscussed in 
> „Generic `typealias`s” thread: > 
> https://lists.swift.org/pipermail/swift-evolution/2015-December/000132.html> 
> .The core Swift team approves:
> > > Yes, this isdefinitely something that I (at least) would like to see. 
> Patcheswelcome :-)> > Chris(Lattner)
> All the best,> Krzysztof
>
> On 7 December 2015 at 12:41:05, Tuur Antonvia swift-evolution (> 
> swift-evolution at swift.org> )wrote:
>
>> Can you please add these features in Swift3?
>> 1. The ability to do this:>> extension Array<Double> {>>     //extend 
>> arrays of doubles>> }
>> 2. Generic typealiases:>> struct Foo<T,V> {>>     let t: T>>     let v: 
>> V>> }>> typealias IntFoo<V> = Foo<Int,V> //Error inSwift 2.1>> 
>> _______________________________________________
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>> https://lists.swift.org/mailman/listinfo/swift-evolution
>> 
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