[swift-evolution] Computed properties: get and set using shorthand notation?

Jessy Catterwaul mr.jessy at gmail.com
Wed Feb 3 16:24:15 CST 2016


If functions start using shorthand argument names, I would probably feel more comfortable with it. Is that being discussed?

> On Feb 3, 2016, at 5:22 PM, T.J. Usiyan <griotspeak at gmail.com> wrote:
> 
> +1 for both. I don't think that I would prefer the $0 syntax in most cases but I would appreciate making the syntax more consistent.
> 
> TJ
> 
> On Wed, Feb 3, 2016 at 5:08 PM, Jessy Catterwaul via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> wrote:
> +1 on implicit return
> -1 on $0; I like newValue more than it.
> 
> I also think the return type should be implicit.
> 
>> On Feb 3, 2016, at 5:00 PM, Chris Liscio via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> wrote:
>> 
>> Why can’t we use shorthand argument names and implicit returns when specifying the get and set blocks in a computed property? I.e., Why must we refer to newValue in the implementation of set, and not $0 like we do in closures? Also, why do we need ‘return’?
>> 
>> Once you get used to the shorthand, you kinda want to use it all over…
>> 
>> This question came up recently when I was writing a façade for another class, and would have liked to written something like the following:
>> 
>> class Façade {
>>   private var _wrapped: Something
>> 
>>   var wrappedProperty: Int {
>>     get { _wrapped.property }
>>     set { _wrapped.property = $0 }
>>   }
>> 
>>   var multipliedProperty: Int { _wrapped.property * 42 }
>> }
>> 
>> I apologize if this has already been discussed/requested before. I searched the archives and didn’t turn up anything that referred to this specifically.
>> 
>> Thanks!
>> 
>> Chris Liscio
>> http://supermegaultragroovy.com <http://supermegaultragroovy.com/>
>> Learn _your_ music with Capo: http://capoapp.com <http://capoapp.com/>
>> 
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