Alright. Does this mean that we can otherwise assume that collections share indices with their subsequences? It might be worth documenting, one way or the other.
> On 14 Oct 2016, at 02:40, Hooman Mehr <hoo...@mac.com> wrote: > > This is a bug reported multiple times in different forms. My version of it > is: SR-1487 <https://bugs.swift.org/browse/SR-1487>. > > It remains open because it is not easy to fix with the existing design of > String. Apparently core standard library team are working on an overhaul of > String to address this and other usability and performance issues. > >> On Oct 13, 2016, at 5:12 PM, Tim Vermeulen via swift-users >> <swift-users@swift.org <mailto:swift-users@swift.org>> wrote: >> >> Is it a requirement that collections share indices with its subsequence? >> Array and ArraySlice do share indices, which is why ArraySlice isn’t >> zero-based, and I think this is convenient. But String.CharacterView doesn’t >> seem to share indices with its subsequence (which is String.CharacterView as >> well). Consider this example: >> >> let foo = "foobar".characters >> >> let index = foo.index(foo.startIndex, offsetBy: 3) >> let bar = foo.suffix(from: index) // "bar" >> >> foo[index] // "b" :) >> foo[bar.startIndex] // "f" :( >> >> So does this mean that we can’t assume that collections and their >> subsequences share their indices (which could be very handy), or is this >> just a bug related to String.CharacterView? >> _______________________________________________ >> swift-users mailing list >> swift-users@swift.org <mailto:swift-users@swift.org> >> https://lists.swift.org/mailman/listinfo/swift-users >
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