Thanks for pointing me at it; at a quick read I like the functionality, but will have to take a closer look to get a sense of its feel in use.
It certainly addresses the current gripes I have around `CollectionType` requiring a `ForwardIndexType`: for all but the truly-linear collections (e.g., Array-like) implementing `successor()` either forces you to hold a back-reference, or leaves you choosing between holding a back-reference or having rather “fat” indices. If the collection becomes responsible for moving the index this is all mooted; I can finish the sketched refactoring proposal and simply refer to this (prototype? proposal?) as something else that’d be needed to get the full benefit. > On Jan 2, 2016, at 11:24 AM, Dmitri Gribenko <griboz...@gmail.com> wrote: > > On Sat, Jan 2, 2016 at 4:53 AM, Dave Abrahams via swift-evolution > <swift-evolution@swift.org> wrote: >> >>> On Jan 1, 2016, at 4:34 PM, plx via swift-evolution >>> <swift-evolution@swift.org> wrote: >>> >>> I was preparing a proposal-sketch relating to this earlier discussion: >>> http://article.gmane.org/gmane.comp.lang.swift.evolution/1629 >>> >>> …which is largely about inserting "intermediate steps” between >>> `SequenceType` and `CollectionType`, but to get the full benefit would >>> likely wind up requiring modifications to the API on the `*Index` types >>> (e.g. `ForwardIndexType`, which at present is required of a >>> `CollectionType`’s `Index`). >>> >>> Searching for prior discussion/work I found this bug: >>> https://bugs.swift.org/browse/SR-122 , and was curious if anything further >>> has happened on that topic? >> >> Yes, Dmitri has been making progress on an implementation. He may be able >> to point you at it… > > The prototype is checked in at > test/Prototypes/CollectionsMoveIndices.swift, feel free to ask me more > questions about it. > > Dmitri > > -- > main(i,j){for(i=2;;i++){for(j=2;j<i;j++){if(!(i%j)){j=0;break;}}if > (j){printf("%d\n",i);}}} /*Dmitri Gribenko <griboz...@gmail.com>*/ _______________________________________________ swift-evolution mailing list swift-evolution@swift.org https://lists.swift.org/mailman/listinfo/swift-evolution
