[swift-evolution] Class scoped access level

Paul Cantrell cantrell at pobox.com
Mon Sep 12 09:56:01 CDT 2016

> On Sep 10, 2016, at 5:25 PM, Charles Srstka <cocoadev at charlessoft.com> wrote:
>> On Sep 10, 2016, at 2:52 PM, Xiaodi Wu via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> wrote:
>> Is that (i.e. having properties in extensions) listed in the completing generics manifesto? It certainly seems like it'd be a worthwhile feature to consider under that umbrella.
> I think that came up at some point, but was deemed not to be implementable in a sufficiently performant way.

It seems like it ought to be implementable for _in-module_ extensions, since presumably the memory layout of each type is fungible until the module is compiled.

In-module extensions address the use case I had in mind, namely breaking apart a large type by isolating some private properties within extensions. It seems like the possible and the desirable may actually intersect here.


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