[swift-evolution] [Discussion] stride behavior and a little bit of a call-back to digital numbers

[Joe Groff]

> On Feb 27, 2016, at 6:54 PM, Erica Sadun <erica at ericasadun.com> wrote:
> 
> 
>> On Feb 27, 2016, at 7:30 PM, Joe Groff via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> wrote:
>> Forloopians probably don't care whether Float is Strideable, as long as it
>> has working stride methods. If those methods are better than what they'd
>> write naively, well, that's even better justification for taking the C loop
>> away. 
> 
> How about something like https://gist.github.com/erica/3cd5633b9e139844aa5a <https://gist.github.com/erica/3cd5633b9e139844aa5a>
Functionally that seems reasonable. IMO it wouldn't be a problem to call the Double variant `stride(through:by:)` to match the integer form. Just for fun, you could simplify the condition here:

        if stride > 0.0 ? current >= end : current <= end {

by using 'if signbit(current - end) == signbit(stride)' instead.

-Joe

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