[swift-evolution] Import Conditionals

[Saagar Jha]

I believe there was a draft to merge all the "Libc" modules; let me see if
I can find that.

On Mon, Oct 17, 2016 at 3:06 PM Sean Alling via swift-evolution <
swift-evolution at swift.org> wrote:

> *Description*
>
> In an effort to both (1) reduce boilerplate code, and (2) promote
> cross-platform reusability I propose that we implement the following *Import
> Conditional Operators*:
>
> *`||` *and `*&&`*
>
> Currently, import conditionals must be implemented like so:
>
> ```
> #if os(Linux) || os(FreeBSD)
> import Glibc
> #else
> import Darwin
> #endif
> ```
>
> With *import conditional operators* this would be condensed to:
>
> ```
> import Glibc || Darwin
> ```
>
> The first library/framework (Glibc) would be imported if found and the the
> second (Darwin) only in the event the first should fail.
>
> *Other Caveats:*
>
> *(A) —  *we could limit this to one conditional operator per import line
> OR we could implement order of operations. Obviously, there are tradeoffs
> of both that we should discuss.
>
> *(B) —* if-conditional statements currently explicitly show the import
> conditions (i.e., os(Linux) || os(FreeBSD)) this would be a detriment to
> this new feature. I would argue that the reduction of boilerplate code
> would in itself be worth this abstraction.
>
>
> --
> Sean Alling
>
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>
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