[swift-evolution] Change subscripts to use colons

[Sean Heber]

The only thing that really bugs me about subscript is that you declare it with (), but use it with []. I’ve never found the return indicator to be confusing here. I get the argument in favor of property-ness, though.

Wouldn’t mind considering using square brackets instead, but perhaps that has already been tried and rejected at some point:

subscript[_ position: Int] -> {}

l8r
Sean


> On Jul 11, 2016, at 2:32 PM, James Froggatt via swift-evolution <swift-evolution at swift.org> wrote:
> 
> Interesting way to think of the ‘->’ operator.
> 
> Perhaps a <-> operator could represent this two-way mapping?
> 
>> On 11 Jul 2016, at 20:29, Erica Sadun <erica at ericasadun.com> wrote:
>> 
>> On Jul 11, 2016, at 1:21 PM, James Froggatt via swift-evolution <swift-evolution at swift.org> wrote:
>>> 
>>> Thanks for letting me know this has been tried before, I'm actually in the process of drafting the proposal now.
>> 
>> I'd hesitate to try to do something off-beat and "blend" them but it amuses me no end that the :-> operator looks so very happy.
>> 
>> subscript(_ position: Int) inout :-> Element { get { … } set { … } }
>> 
>> Nonetheless, I do want to point out that unlike properties, subscripts provide a mapping between a domain and a range so it feels more natural to me to use -> than :.
>> 
>> -- E
>> 
>> 
>> 
> 
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