[swift-evolution] Availability checking of libraries (weak linking?)

[Swizzlr]

Thanks all, Ben's answer was exactly what I was looking for; Slava's suggestion merits discussion perhaps when canImport is available.

Thanks again!

Tom

Sent from my iPhone

> On 19 Jan 2017, at 02:07, Ben Rimmington <me at benrimmington.com> wrote:
> 
> 
>> On 19 Jan 2017, at 00:24, Swizzlr wrote:
>> 
>> Say I have an awesome type, and I provide some extensions that makes it work really well with a few other packages.
>> 
>> I don't want to force those packages on my users, but if they have them, I want to extend them with my awesome type/function/whatever convenience.
>> 
>> What can be done in code and package manager to weakly link (not literally, I just mean have that behaviour) my awesome type with all these other libraries?
>> 
>> This is a prelude to a pitch, if there isn't a decent alternative.
>> 
>> Tom
> 
> <https://github.com/apple/swift-evolution/blob/master/proposals/0075-import-test.md>
> 
> #if canImport(...) should be available in Swift 4, thanks to Robert Widmann.
> 
> <https://github.com/apple/swift/pull/5778>
> <https://github.com/apple/swift/pull/6547>
> 
> -- Ben
>