[swift-evolution] Smart KeyPaths

Brent Royal-Gordon brent at architechies.com
Fri Mar 17 17:24:12 CDT 2017

> 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.

Brent Royal-Gordon

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