This sounds like a scenario where you'd be using or extending an existing stdlib generic type such as Set, no? On Fri, Jul 8, 2016 at 15:53 Tino Heth via swift-evolution < swift-evolution@swift.org> wrote:
> Right now I'm working on a lib for charts/plots, and I choose to create a > custom interval-type that has no comparable requirement. > Of course, as soon as I leave the completely abstract and generic world, I > need to bring things into an order — but if this order has to be defined by > a global function "<", there is a loss in flexibility. > My plan is to use "<" as a default wherever possible to define my ranges, > with the option to change it to a custom alternative; maybe similar > reasoning can be applied to the index-problem. > > Tino > > Real world example: > Let's assume I want to create a bar-chart to compare the population of > several countries. > There is no natural order for countries (I hope we can agree on that ;-), > so no matter how I'd model them, it would feel wrong to define "<": > Sort by name might be the most obvious choice, but it could also be the > size, the timezone, average income, the peak hight of its highest > mountain... > Additionally, I might want to use different orders for different charts, > which is only possible when I can change the function which dictates the > order. > _______________________________________________ > swift-evolution mailing list > swift-evolution@swift.org > https://lists.swift.org/mailman/listinfo/swift-evolution >
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