Wow there are some real doozy inout code examples in there, showing aliasing much more fun than my snippet. Unfortunately I can't understand anything else the doc is talking about. I guess I'll just say a prayer and throw salt over my shoulder if using inout.
On Sat, Jun 11, 2016 at 6:05 PM, Brent Royal-Gordon <br...@architechies.com> wrote: >> My recollection is that in Swift the subscript operator (`arr[2]` in this >> case) can refer to the setter xor the getter, but not both within the same >> statement. > > Quite to the contrary. Rather than using the setter directly, Swift often > uses `materializeForSet`, a combined get-and-set operation which is much more > efficient, particularly when assigning directly into arrays. To keep from > having to use very slow access all the time, it imposes a rule (which is not > and cannot be enforced by the compiler) that you can't hold two mutable > references to overlapping storage simultaneously, or they may do strange > things like lose some of the writes you make. > > Here's an old design document discussing some things in this area: > <https://github.com/apple/swift/blob/73841a643c087e854a2f62c7e073317bd43af310/docs/proposals/Accessors.rst> > I'm not sure how authoritative it is, but it might give you an idea of > what's going on. > > -- > Brent Royal-Gordon > Architechies > _______________________________________________ swift-users mailing list swift-users@swift.org https://lists.swift.org/mailman/listinfo/swift-users
