Thank you everyone for your comments. Adding willChangeValue(forKey:) and didChangeValue(forKey:) to Operation does solve the problem for me. The Swift 3 code I'm porting from macOS to Linux works correctly when I patch Foundation as Brent suggests.
I've opened a PR against swift-corelibs-foundation and would welcome feedback on this. Thank you. https://github.com/apple/swift-corelibs-foundation/pull/836 P.S. The code I'm porting is roughly analogous to https://gist.github.com/ianpartridge/e3b8496cb114005a93f5c86ff76af630 although it uses URLSession instead of an async dispatch queue. On 23 January 2017 at 17:32, Tony Parker <anthony.par...@apple.com> wrote: > Hm, that’s probably the least bad option we have at the moment. > > I don’t want to introduce “new” API, as it is unlikely we will be able to > remove it when whatever permanent solution comes up. > > - Tony > >> On Jan 21, 2017, at 6:09 AM, Brent Royal-Gordon via swift-corelibs-dev >> <swift-corelibs-dev@swift.org> wrote: >> >>> On Jan 20, 2017, at 7:55 AM, Ian Partridge via swift-corelibs-dev >>> <swift-corelibs-dev@swift.org> wrote: >>> >>> Is there any way that we could support asynchronous operations in >>> swift-corelibs-foundation, in the absence of KVO? >> >> Could we add `willChangeValue(forKey:)` and `didChangeValue(forKey:)` >> methods just to `Operation` which only handle an `isFinished` key? >> Presumably they'd just look like: >> >> public func willChangeValue(forKey key: String) { >> // do nothing >> } >> public func didChangeValue(forKey key: String) { >> if key == "isFinished" && isFinished { >> finish() >> } >> } >> >> I believe that would make existing code just work without needing to do >> anything special. >> >> -- >> Brent Royal-Gordon >> Architechies >> >> _______________________________________________ >> swift-corelibs-dev mailing list >> swift-corelibs-dev@swift.org >> https://lists.swift.org/mailman/listinfo/swift-corelibs-dev > -- Ian Partridge _______________________________________________ swift-corelibs-dev mailing list swift-corelibs-dev@swift.org https://lists.swift.org/mailman/listinfo/swift-corelibs-dev
