[swift-evolution] Pitch: Progress Tracking in Swift

Tim Hawkins tim.thawkins at gmail.com
Mon Jan 18 21:45:59 CST 2016

How would this work on linux or windows?, on linux there are several dozen
possible GUI targets, this sounds far more like a standard patterm
recomendation that GUI binding library authors should provide than
something that should be a language feature.
On Jan 19, 2016 11:39 AM, "Charles Srstka via swift-evolution" <
swift-evolution at swift.org> wrote:

> On 2016-01-18 22:24, FĂ©lix Cloutier wrote:
>> In terms of which functions need it, I think that reporting progress
>> is a relatively niche feature.
> How is it niche? Very few apps don't have any places where progress
> tracking (and user cancellation) would be useful, and it's currently
> something that has to be done with workarounds that are either clunky or
> unsafe.
> I would by far prefer that we work on
>> infrastructure to implement a library-driven solution. To me, it would
>> be a missed opportunity to show off what the language can (will be
>> able to) do without having to bake it into the compiler.
>> For instance, this could probably be solved without specific compiler
>> support if Swift had a macro system and resumable functions.
> Apple has repeatedly stated in the past that the lack of macros/a
> preprocessor is supposed to be a feature, not a bug (cf.
> https://developer.apple.com/swift/blog/?id=4). I know there have
> occasionally been some statements on the lists contradicting the official
> stance, but nonetheless I'm not sure we can count on Swift gaining a macro
> system. Also, implementing things like this via macros seems a bit... icky
> to my personal tastes.
> Are there any plans to add resumable functions to Swift? I know it's been
> pitched a few times, but it didn't seem to me like it gained much traction.
> Also, the first two arguments have merit, but it's highly improbable
>> that you'll be able to use whatever solution we come up with in OSes
>> older than OS X 10.11 or iOS 9 anyway.
> All additions to Swift so far have been back-portable to 10.9, given that
> the runtime gets bundled into the app.
> Charles
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