> On Apr 3, 2016, at 10:21 PM, Thorsten Seitz via swift-evolution > <swift-evolution@swift.org> wrote: > > As the problem seems to be to eliminate having to write the extension with > all its duplication, I'd prefer a more general solution instead of > introducing the notion of an "optional" function: just make it possible to > write default implementations inline in a protocol definition.
I think we can consider it as a given that, at some point, we’ll be able to write default implementations inline in the protocol definition. It’s not there now because we never got around to implementing it. > Documenting the optionality can be done in the doc comment, maybe with a new > documentation keyword "default". Having "optional" in the code has no > additional value over a comment because the method is not optional in the > Obj-C sense and the proposal requires a default value. Therefore the presence > of "optional" has essentially no effect at all and is better moved into a > comment. I tend to agree. ‘optional’ and the ‘= value’ syntax are fairly heavyweight language mechanisms for what is effectively documentation. - Doug > > -Thorsten > > Am 04.04.2016 um 00:13 schrieb Chris Lattner via swift-evolution > <swift-evolution@swift.org <mailto:swift-evolution@swift.org>>: > >> >>> On Apr 3, 2016, at 10:40 AM, Andrey Tarantsov <and...@tarantsov.com >>> <mailto:and...@tarantsov.com>> wrote: >>> >>>> Protocol requirements with default (no-op) implementations already satisfy >>>> that design goal, no? >>> >>> Chris, as we've discussed in a thread that I think got forked from this one: >>> >>> Yes, they do technically, but it would be nice to both: >>> >>> 1) make it an obvious documented part of the signature, possibly including >>> the default return value >>> >>> 2) possibly make it less verbose by getting rid of the explicitly spelled >>> out protocol extension >> >> Right, but “more is worse” when it comes to language design. Having a "more >> general" facility that greatly overlaps with a “more narrow” facility always >> makes us question whether it is worth the complexity to have both. >> >> -Chris >> >> _______________________________________________ >> swift-evolution mailing list >> swift-evolution@swift.org <mailto:swift-evolution@swift.org> >> https://lists.swift.org/mailman/listinfo/swift-evolution >> <https://lists.swift.org/mailman/listinfo/swift-evolution> > _______________________________________________ > swift-evolution mailing list > swift-evolution@swift.org > https://lists.swift.org/mailman/listinfo/swift-evolution
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