[swift-evolution] [Proposal] Sealed classes by default

[John McCall]

> On Jun 29, 2016, at 11:11 AM, Xiaodi Wu via swift-evolution <swift-evolution at swift.org> wrote:
> Do we really need a new keyword? Since we already have syntax like `internal(set)` couldn't we do `internal(unsealed)`, etc.

The spelling is definitely up for debate.  I remember that Chris in particular wasn't happy with "sealed".

(Of course the entire proposal is still up for debate; I'm just saying that so far we've been talking about the proposal at a high level with very little attention to specifics.)

John.


> 
> On Wed, Jun 29, 2016 at 12:21 PM, David Sweeris via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> wrote:
> > On Jun 29, 2016, at 12:15 PM, Michael Peternell <michael.peternell at gmx.at <mailto:michael.peternell at gmx.at>> wrote:
> >
> >
> >> Am 29.06.2016 um 15:54 schrieb David Sweeris via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>>:
> >>
> >> +1 for the concept of a "sealed” class.
> >> -1 for making it default.
> >
> > Aren't sealed classes already implemented? I think the keyword is `final`..
> > So there is nothing left to do :)
> 
> No, `final` doesn’t allow for any subclassing, but `sealed` allows for subclassing within your module (where you can presumably write more efficient code based on knowledge of each subclass).
> 
> - Dave Sweeris
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