[swift-evolution] Feature proposal: Range operator with step

[Jordan Rose]

> On Mar 25, 2016, at 9:19 , Dave Abrahams via swift-evolution <swift-evolution at swift.org> wrote:
> 
> 
> on Thu Mar 24 2016, Brent Royal-Gordon <swift-evolution at swift.org> wrote:
> 
>>> That
>>> would imply that floating types should not conform to Strideable,
>>> which raises the question of whether Strideable should be folded into
>>> the Integer protocol.
>> 
>> Personally, I get a lot of mileage out of conforming NSDate to
>> Strideable. 
> 
> I just recalled that Unsafe[Mutable]Pointers are also Strideable.  So
> Strideable stays.
> 
> Question: by what unit should
> 
>        for d in d0...d2 {}
> 
> be iterating?  Or should it be disallowed without a .striding(by: )?
> 
> If the latter, NSDate might fall into the same bucket as floating types.

Strong vote to require a unit here, especially given that .minutes, .hours, .days, .months, and .years are all non-uniform intervals that are nonetheless useful to stride by!

Jordan