Re: How does the Swift Darwin module work?
Re: How does the Swift Darwin module work?
- Subject: Re: How does the Swift Darwin module work?
- From: Rick Mann <email@hidden>
- Date: Sat, 18 Oct 2014 18:03:56 -0700
> On Oct 18, 2014, at 16:40 , Roland King <email@hidden> wrote:
>
>
>> On 19 Oct 2014, at 5:23 am, Jean-Daniel Dupas <email@hidden> wrote:
>>
>> AFAIK, variadic C functions are not (yet) callable from swift code.
>>
>>
>
> They aren’t - I didn’t remember fnctl() was varidadic. I shall quote an Apple engineer then ..
>
> "This is not possible in Swift. C variadics are inherently unsafe, and not compatible with Swift variadics. You're encouraged to provide alternate versions of your collection-y variadics that take an array. Your format-y variadics (like this one?) can use Swift's String's variadic initializers ahead of time."
>
> So you get to go wrap fcntl() in something else it seems.
So, how would I do that, exactly? I suppose I have to pass Objective-C collection types to a method (which could be a straight C function) from a Swift call? That is, can a Swift variadic call translate into a C function call that accepts Obj-C collections?
--
Rick Mann
email@hidden
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