on Tue Apr 05 2016, Xiaodi Wu <xiaodi.wu-AT-gmail.com> wrote: > I think my opinion is largely the same. A range is not a stride,
I don't think anyone on this thread has suggested they could be considered the same... until just now. > and sometimes we have use for striding backwards, a use case that > shouldn't be penalized. +1 to the free function. > > I wouldn't mind, orthogonally, a way to express (a, b] as a range. It > just seems like that should be of use, somewhere. But that's not a strong enough reason to add it to the standard library. > Finally, orthogonal to all of the above, I'm super eager to end error > accumulation in floating point strides. Looking forward to those results, too! > On Tue, Apr 5, 2016 at 6:52 PM Erica Sadun via swift-evolution > <swift-evolution@swift.org> wrote: > > On Apr 5, 2016, at 5:22 PM, Dave Abrahams via swift-evolution > <swift-evolution@swift.org> wrote: > I don't think that's obvious at all, because 0 ≮ 10 > > Points brought up elsewhere: > > * A range does not have direction, it is is an area of variation between > lower and upper limits. > * A range does not go from a larger amount to a smaller amount because it > is > not a sequence > * Much of this problem goes away with striding (as Dave pointed out > several > times, sorry Dave) > > After consideration, I have been persuaded to the opinion that > > stride(from: 0, to: -10, by: -1) > > and > > (-9...0).reverse() > > both represent the numbers -9, -8,...,0 better than any alternatives I > have > offered. I still > prefer the stride version for intent and clarity. > > That said, I also prefer my revised SE-0051 semantics for better > representing what strides will > attempt to do. > > -- Erica > > p.s. Thanks all for the patient explanations > > _______________________________________________ > swift-evolution mailing list > swift-evolution@swift.org > https://lists.swift.org/mailman/listinfo/swift-evolution > -- Dave _______________________________________________ swift-evolution mailing list swift-evolution@swift.org https://lists.swift.org/mailman/listinfo/swift-evolution