[swift-evolution] [Proposal] Protected Access Level

[Tino Heth]

> 
> I can't reply directly to all the points in this thread, but I will just say that there are ways of emulating protected in the language as it exists today:
> 
> If the goal is to have functions that can be overridden by subclasses without being called by external classes, you can create a parameter of a public type with a private initializer and use it in all "protected" member functions. No external code will be able to call such functions because they cannot create an argument of the correct type.
As others stated before:
I agree it's a cool little hack, but a hack none the less — and imho it isn't useful in real life.
The focus should be documenting intend ("this method should be used in a certain way"). Creating clever countermeasures to stop users of a library to enforce limitations is imho the wrong way.
<not serious>
We could even use tools like public key cryptography to secure access to APIs — or is there any developer who doesn't want to deal with more certificates? ;-)
</not serious>

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