[swift-users] OptionSet as Sequence

[Zhao Xin]

I don't see the needs to call `for domain in domains` with `domains:OptionSet`.
If a parameter want an OptionSet, why not just use`domains` directly
instead of `domain`?

Zhaoxin

On Mon, Mar 13, 2017 at 12:09 AM, J.E. Schotsman via swift-users <
swift-users at swift.org> wrote:

> Hello,
>
> Recently I wrote code like this:
>
> let domains:[FileManager.SearchPathDomainMask] = [.userDomainMask,
> .localDomainMask, .networkDomainMask]
> for domain in domains { … }
>
> But I would prefer this:
>
> let domains:FileManager.SearchPathDomainMask = [.userDomainMask,.localDomainMask,
> .networkDomainMask]
> for domain in domains { … }
>
> This requires this OptionSet to conform to Sequence.
> Would it be possible to generically conform all OptionSets with
> RawValue:IntegerArithmetic to Sequence?
> I’ve tried but it seems to be tricky.
>
> Jan E.
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