[swift-evolution] [Review #2] SE-0117: Default classes to be non-subclassable publicly

[Jose Cheyo Jimenez]

> On Jul 19, 2016, at 4:13 AM, James Froggatt via swift-evolution <swift-evolution at swift.org> wrote:
> 
> Based on the discussion, I think the real danger of subclassing is unexpected behaviour - in other words, overriding methods. There doesn't seem to be a need to penalise subclasses which just add properties and extra methods based on them.
> 
> I'd be in favour of keeping current behaviour for classes, but having to mark methods explicitly as overrideable, virtual, open, or whatever semantics we decide upon. This seems like the safest syntax.
> 
> I'd also support a grouping mechanism for marking methods in this way, similar to extensions' current auto-annotation for ‘public’.
The is a proposal waiting to be merged that seeks to disallow public extensions auto-annotation. I think extensions would be better with out it. 


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> Hello Swift community,
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> The second review of "SE-0117: Default classes to be non-subclassable publicly" begins now and runs through July 22. The proposal is available here:
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> https://github.com/apple/swift-evolution/blob/master/proposals/0117-non-public-subclassable-by-default.md
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