[swift-evolution] [Proposal][Discussion] Modular Swift

[Robert Widmann]

Once again, internal is your keyword.  An extension allows you to “open and expand” the module boundary here, which is exactly what you want here - to extend this module across file boundaries without showing your cards to an external consumer of your framework. 

> On Feb 21, 2017, at 10:26 PM, Xiaodi Wu <xiaodi.wu at gmail.com> wrote:
> 
> On Tue, Feb 21, 2017 at 9:08 PM, Robert Widmann via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> wrote:
> Sorry, been replying to multiple sub-threads today.
> 
> 
> For bar(), because you wish to be able to
> 
> 1) Not export it across the outermost module boundary
> 2) But still use it internally
> 
> Internal access is required.  Any higher and you would export (violating 1), any lower and you wouldn’t be able to internally import (violating 2).
> 
> For baz(), because you wish to be able to
> 
> 1) Not export it across the outermost module boundary,
> 2) Or even your own internal submodule boundary
>  
> 3) But still use it within the same submodule, across different file boundaries: this is the feature that many people have stated they want to emerge out of a submodule design.
> 
> Private or fileprivate suffices depending on the scoping you wish for it to have within the file/interface it’s a part of relative to the other APIs in the submodule.
> 
> > On Feb 21, 2017, at 10:04 PM, Brent Royal-Gordon <brent at architechies.com <mailto:brent at architechies.com>> wrote:
> >
> > I specified two different behaviors for `bar()` and `baz()`. I see now that you describe `internal` as having the behavior I want for `bar()`. Is there a way I can get the behavior I want for `baz()`?
> >
> > --
> > Brent Royal-Gordon
> > Sent from my iPhone
> >
> > On Feb 21, 2017, at 6:51 PM, Robert Widmann <devteam.codafi at gmail.com <mailto:devteam.codafi at gmail.com>> wrote:
> >
> >>> What access modifiers do I put on `bar()` and `baz()` so that `MyMod` can access `bar()` but not `baz()`, and code outside `MyMod` can access neither `bar()` nor `baz()`?
> >>>
> >>
> >> internal
> 
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