Joe Groff on Twitter: "@mjtsai 'final' also influences things like dynamic casts and protocol conformance. e.g. Don't need to be covariant if there's no subtyping."

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Joe Groff ‏@jckarter Jul 18

@colincornaby OTOH, components that interface with protocols have *more* flexibility for mocking and hotfixing than subclassing.
1 retweet 6 likes
Dr. Sneed ‏@bsneed Jul 18

@jckarter @colincornaby , and this proposal isn't really forcing them to do that, it feels more like just creating pain on end-users.
1 like
Joe Groff ‏@jckarter Jul 18

@bsneed @colincornaby It doesn't affect end users at all. The frameworks aren't going to spontaneously rewrite themselves in Swift.
2 likes
Michael Tsai ‏@mjtsai Jul 18

@jckarter @bsneed @colincornaby If it truly “doesn’t affect end users at all,” what could be the point of the change?
2 likes
Joe Groff ‏@jckarter Jul 18

Joe Groff Retweeted Joe Groff

@mjtsai @bsneed @colincornabyhttps://twitter.com/jckarter/status/755149856994316288 …

Joe Groff added,

Joe Groff @jckarter

@bsneed @colincornaby The default is all about making sure API authors don't make irrevocable mistakes without thinking about them.
Michael Tsai ‏@mjtsai Jul 18

@jckarter Right, but presumably you expect that to ultimately benefit end users (indirectly).
Joe Groff ‏@jckarter Jul 18

@mjtsai Users who are third-party framework devs I expect will benefit the most.
1 retweet 5 likes
Michael Tsai ‏@mjtsai Jul 18

@jckarter You’re saying no change for Apple Swift frameworks because you consider the API, but it’s about protecting others who don’t?
Joe Groff ‏@jckarter Jul 18

@mjtsai Many users would prematurely reach for 'final' to get a similar effect and be stuck with it w/o the new default behavior.
3 likes
Michael Tsai ‏@mjtsai Jul 18

@jckarter I would have thought you could revoke a final across a module boundary because clients can’t inline, anyway.

‏@jckarter

@mjtsai 'final' also influences things like dynamic casts and protocol conformance. e.g. Don't need to be covariant if there's no subtyping.

5:09 PM - 18 Jul 2016

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