[swift-evolution] classprivate protection level?

[Mike Kluev]

On 30 October 2017 at 23:14, Adam Kemp <adam_kemp at apple.com> wrote:

>
> > On Oct 30, 2017, at 4:10 PM, Mike Kluev <mike.kluev at gmail.com> wrote:
> >
> > "classprivate" helps to resolve this problem. if it is marked so
> developer will at least think twice before making an extension to use it
>
> Why would they think twice, though? You’ve told them extensions can use
> it, and they’ve written an extension to use it. What did they do wrong? I
> don’t think the rules are nearly as clear as for protected.
>

this is obvious: when they are writing a method in their own class and try
to call: some.foo() it will give them and access level error (or even
before that the autocomplete will not work as an early hint), they will
reveal foo's definition, see "classprivate" in there and at that very point
take a pause, think and make a conscious decision whether they really want
it or not. if they really want it they will make an extension (which would
be a legitimate use of it) if they don't need it really - they will find
another way without making an extension. the (reasonable) expectation is
that such a "classprivate" will reduce the number of instances where "foo"
is used thus reducing the "working set" of instances i have to review when
making a change to it.

Mike
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