Good idea to add `seconds`/`days`/`solarMonths`/`lunarMonths`/etc. views that are Strideable
-- Howard. On 30 March 2016 at 13:57, Joe Groff via swift-evolution < swift-evolution@swift.org> wrote: > > > On Mar 28, 2016, at 5:33 PM, Brent Royal-Gordon <br...@architechies.com> > wrote: > > > >>> Floating-point seconds (as NSTimeIntervals) are the natural > Strideable.Stride, but it's not particularly clear to me that you want 1 > second to be a default stride. It's the default you would guess, but it's > not actually a particularly useful default. > >> > >> Any fixed-time-period stride with dates is fraught with peril. Not > every day is 24 hours, not every minute is 60 seconds, etc. Working with > dates requires enough special domain knowledge that I think it'd be harmful > to try to genericize numeric concepts over it. > > > > While this is true, "ten seconds from now" is always ten seconds from > now, and "seconds between date1 and date2" is always the same number of > seconds. There is a basic level of time measurement and manipulation which > is completely independent of time zones and calendars; that's what NSDate > and NSTimeInterval represent. They are needed fairly often, and they are > perfectly compatible with Strideable's semantics. > > Perhaps, but if you make Date strideable by seconds and automatically > receive a bunch of utility methods based on that, then it becomes really > tempting to abuse absolute time periods, or to accidentally misuse generic > Strideable utilities instead of calendar-aware ones. We don't make String a > sequence for similar reasons (though perhaps, by analogy to String, there > could be `seconds`/`days`/`solarMonths`/`lunarMonths`/etc. views that are > Strideable). > > -Joe > _______________________________________________ > swift-evolution mailing list > swift-evolution@swift.org > https://lists.swift.org/mailman/listinfo/swift-evolution >
_______________________________________________ swift-evolution mailing list swift-evolution@swift.org https://lists.swift.org/mailman/listinfo/swift-evolution
