[swift-corelibs-dev] Wrapping up Swift 3 for swift-corelibs

[Tony Parker]

Hi Gonzalo,

While not a complete solution for the issues around bridging, the work on id-as-Any that I mentioned below was meant to help address these platform differences.

For example, let’s say you had a Foundation API that looked like this in ObjC:

- (void)foo:(id)x;

and imported like this into Swift:

func foo(_ x : AnyObject)

On Linux, attempting to call this:

bar.foo(“hello”)

would result in an error, because String is not an object type. On Darwin, String was implicitly bridged to NSString here for you.

Now (hopefully — I’m still working on verifying this), the above is imported like this:

func foo(_ x : Any)

which means that on Linux, this should actually work:

bar.foo(“hello”)

because String is indeed an Any. No need to do something like “hello”.bridge().

AnyHashable also helps. because we should be able to express API which takes untyped dictionaries with AnyHashable keys instead of NSObject keys.

Most of this stuff has only landed in the last week or two, so if you can give it a try and let us know how well it works out, that would be great.

- Tony

https://github.com/apple/swift-evolution/blob/master/proposals/0116-id-as-any.md
https://github.com/apple/swift-evolution/blob/master/proposals/0131-anyhashable.md


> On Jul 29, 2016, at 11:06 AM, Gonzalo Larralde <gonzalolarralde at gmail.com> wrote:
> 
> Hi everyone,
> 
> Wanted to know if there's any plan to find a solution for Auto Bridging between corelibs-foundation <> Swift types in the same manner as it is done for Obj-C.
> 
> There has been some discussions about this in the following PRs:
> 
> https://github.com/apple/swift-corelibs-foundation/pull/310 <https://github.com/apple/swift-corelibs-foundation/pull/310>
> https://github.com/apple/swift-corelibs-foundation/pull/303 <https://github.com/apple/swift-corelibs-foundation/pull/303>
> https://github.com/apple/swift/pull/1994 <https://github.com/apple/swift/pull/1994>
> 
> The inclusion of this feature will allow more non-UIKit related packages to be used with almost  no changes. 
> 
> For what I understand the main blocker here is getting this to pass through Swift review (probably a more generic version of it, like _BridgeableType instead of _ObjectiveCBridgeable would help?), but wanted to understand first if this is a priority for the foundation team, and there is something that can be done to push for this feature.
> 
> Thanks!
> 
> 
> --
> Slds,
> 
> Gonzalo.
> 
> On Thu, Jul 28, 2016 at 6:22 PM, Matt Wright via swift-corelibs-dev <swift-corelibs-dev at swift.org <mailto:swift-corelibs-dev at swift.org>> wrote:
> The overlay changes were merged to corelibs libdispatch this morning. 
> 
> Sent from my iPhone.
> 
> On Jul 28, 2016, at 2:03 PM, Tony Parker via swift-corelibs-dev <swift-corelibs-dev at swift.org <mailto:swift-corelibs-dev at swift.org>> wrote:
> 
>> Hi Dave,
>> 
>> I don’t believe anyone is looking into this. If you want to do that, I think now would be the time!
>> 
>> - Tony
>> 
>>> On Jul 28, 2016, at 10:50 AM, David P Grove via swift-corelibs-dev <swift-corelibs-dev at swift.org <mailto:swift-corelibs-dev at swift.org>> wrote:
>>> 
>>> Tony Parker wrote on 07/28/2016 01:41:55 PM:
>>> > 
>>> > 1. Integrate swift-corelibs-dispatch into Foundation.
>>> 
>>> Hi Tony,
>>> 
>>> Hopefully this is on the task list already, but if it isn't we should add it before it gets to be too late to change the compiler...
>>> 
>>> When compiling a Swift program on Linux that imports Dispatch (or Foundation once the integration is done), the user has to give the extra compilation flags -Xcc -fblocks to enable block support.
>>> 
>>> We really need to land a change somewhere so that either (1) blocks support is always on for Linux or (2) importing Dispatch or Foundation automatically turns on blocks support.
>>> 
>>> I have some time today and tomorrow that I could use to work on this if no one is handling it already, but I'm not sure how best to tackle the problem.  Suggestions?
>>> 
>>> --dave
>>> 
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