I started a discussion thread that may be of interest to you, basically discussing the possibility for directional methods to reduce confusion/clarify intent, should be accessible at the following URL: http://thread.gmane.org/gmane.comp.lang.swift.evolution/19185/focus=19613
> On 24 Jun 2016, at 22:05, David Waite via swift-evolution > <[email protected]> wrote: > > And never mind me. Not sure how I missed that in the docs that many times. > > -DW > >> On Jun 24, 2016, at 1:38 PM, David Waite via swift-evolution >> <[email protected] <mailto:[email protected]>> wrote: >> >> I noticed that the new Collection index(_:offsetBy:) >> <http://swiftdoc.org/v3.0/protocol/Collection/#comment-func-index_offsetby_> >> does not define that negative offsets require a BidirectionalCollection. It >> also declares that negative offsets must complete in O( | offset | ) time. >> This differs from other methods such as distance(from:to:) >> <http://swiftdoc.org/v3.0/protocol/Collection/#comment-func-distance-from_to_>which >> indicates start <= end if not a BidirectionalCollection >> >> This would preclude some data structures from strictly implementing the >> Collection protocol, such as singly-linked lists. >> >> Would it be appropriate to indicate instead that BidirectionalCollection >> defines the negative offset behavior and negative offset performance >> constraint? >> >> -DW >> _______________________________________________ >> swift-evolution mailing list >> [email protected] <mailto:[email protected]> >> https://lists.swift.org/mailman/listinfo/swift-evolution > > _______________________________________________ > swift-evolution mailing list > [email protected] > https://lists.swift.org/mailman/listinfo/swift-evolution
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