> On Apr 6, 2016, at 12:23 PM, Stephen Canon via swift-evolution > <swift-evolution@swift.org> wrote: > > >> On Apr 6, 2016, at 11:20 AM, Stephen Canon via swift-evolution >> <swift-evolution@swift.org <mailto:swift-evolution@swift.org>> wrote: >> >>> On Apr 6, 2016, at 11:16 AM, Dave Abrahams via swift-evolution >>> <swift-evolution@swift.org <mailto:swift-evolution@swift.org>> wrote: >>> >>> One question that I *do* think we should answer, is whether the elements >>> of >>> >>> (0..<199).striding(by: -2) >>> >>> are even or odd. >> >> Odd. I don’t believe that many real use cases care, but odd is more >> efficient from a performance perspective. Needs to be documented clearly, >> however. > > Sorry, I was thinking of (0…199).striding(by: -2). > > For the (0..<199) case, Erica’s assessment seems about right, though it isn’t > at all obvious how it generalizes to floating point strides.
(l..<h).striding(by: -dX) is undefined for floating point strides as there cannot be a starting value. -- E
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