I see three possibilities: 1) # + «space» +«path» like this:
let path = # Bag.things[0].name bag[path] bag[# Bag.things[0].name] bag[# .things[0].name] // Root is inferred as Bag bag.things[0][# Thing.name] bag.things[0][# .name] // Root is inferred as Thing 2) # + «path» like this:: let path = #Bag.things[0].name bag[path] bag[#Bag.things[0].name] bag[# .things[0].name] // Root is inferred as Bag bag.things[0][#Thing.name] bag.things[0][#.name] // Root is inferred as Thing 3) «Root» + # + «path» like this: let path = Bag#things[0].name bag[path] bag[Bag#things[0].name] bag[#things[0].name] bag.things[0][#name] bag.things[0][Thing#name] > On Mar 22, 2017, at 11:47 AM, Matthew Johnson <matt...@anandabits.com> wrote: > > >> On Mar 22, 2017, at 10:36 AM, Vladimir.S via swift-evolution >> <swift-evolution@swift.org <mailto:swift-evolution@swift.org>> wrote: >> >> On 22.03.2017 17:37, Ricardo Parada wrote: >>> >>> >>>> On Mar 22, 2017, at 9:30 AM, Vladimir.S <sva...@gmail.com >>>> <mailto:sva...@gmail.com>> wrote: >>>> >>>> let path = @Bag.things[0].name >>>> >>>> bag@path >>>> bag@.things[0].name >>>> bag@Bag.things <mailto:bag@Bag.things>[0].name >>>> bag.things[0]@.name >>>> bag.things[0]@Thing.name >>> >>> It sounds like the @ character is serving two different purposes which >>> confused me at first. >>> >>> If I understood correctly, you are using it to get the key path but also to >>> apply the key path to the bag struct and get the corresponding value. >>> >> >> Yes. And the initial proposal suggest the following syntax accordingly: >> >> let path = Bag.things[0].name >> bag[path] >> bag[.things[0].name] >> bag[Bag.things[0].name] >> bag.things[0][.name] >> bag.things[0][Thing.name] > > # makes a lot more sense than @ as a sigil. It follows from #selector and > #keyPath. These are the most similar language features right now where the > compiler produces special values. I think it’s also worth noticing that > values produced by #selector and #keyPath are used in normal ways. There is > no magic syntax for their use, just a typed value. If we’re going to make a > change we should use # instead of `.` for accessing these special values but > we should stick with subscript for use. > >> _______________________________________________ >> swift-evolution mailing list >> swift-evolution@swift.org <mailto:swift-evolution@swift.org> >> https://lists.swift.org/mailman/listinfo/swift-evolution >
_______________________________________________ swift-evolution mailing list swift-evolution@swift.org https://lists.swift.org/mailman/listinfo/swift-evolution
