[swift-evolution] Smart KeyPaths

[Matthew Johnson]

Sent from my iPad

> On Mar 17, 2017, at 5:24 PM, Brent Royal-Gordon <brent at architechies.com> wrote:
> 
>> On Mar 17, 2017, at 3:17 PM, Michael LeHew via swift-evolution <swift-evolution at swift.org> wrote:
>> 
>> One thing that gets interesting with the scope-restricted visibility of KeyPaths, is what happens if an fileprivate KeyPath gets leaked out of the file?  That's a scary/maybe useful thing?
> 
> 
> I think that, as long as code within the `fileprivate` scope is responsible for passing the KeyPath out, that's an *extremely* useful thing. It essentially lets a privileged scope delegate its access to a less-privileged scope so it can do complex, potentially read-write work on its behalf. Imagine keeping an instance variable private, but allowing a serialization framework to access it through a key path; that'd be pretty handy.

Agree.  As long as it is manually vended it is semantically pretty similar to passing a closure that reads or writes.  That's the way I would think about it.

> 
> -- 
> Brent Royal-Gordon
> Architechies
> 
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