on Tue Apr 05 2016, Xiaodi Wu <swift-evolution@swift.org> wrote: > On Mon, Apr 4, 2016 at 1:22 PM, Dave Abrahams <dabrah...@apple.com> wrote: >> >> on Sat Apr 02 2016, Xiaodi Wu <xiaodi.wu-AT-gmail.com> wrote: >> >>> [snip] >>> >>> Not included: >>> 1. I know Ranges are in flux, so I've held off on extending Range with >>> a striding(by:) method in this proof-of-concept. >> >> They're not in flux, except for not having been reviewed yet; they are >> settled in the swift-3-indexing-model branch. > > Did not know that. Will have to study what's there in more detail.
Actually, let me amend that. The protocols involved need to be de-underscored, the doc comments need to be written, and I am noticing a few missing things around the edges. But the basic shape of it is stable. > > >>> 2. No attempt at the suggested stride(from:to:steps:) quite yet. >> >> #1 and #2 are mutually exclusive; we prefer #1 as it removes questions >> about the meaning of "to" or "through." > > I wasn't aware that was the thinking. Limiting strides to > `striding(by:)` removes the ability to express `stride(from: 0, to: > -10, by: -1)` because Range enforces (and it looks like it will > continue to do so in the swift-3-indexing-model branch?) `lowerBound > <= upperBound`, and in a half-open range it's the upper bound that's > excluded. > >>> 2. No tests written yet for this proof-of-concept; I noticed that >>> there's a stub for testing strides with bounds of type Double, but >>> there's a comment about things not being ready because Double conforms >>> to RandomIndexType--not sure what to make of that. >> >> Comments in that branch are badly out-of-date. It's worth trying that, >> especially since there is no RandomAccessIndexType in that branch any >> longer. >> >>> 3. Haven't gotten around to testing performance. > _______________________________________________ > 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