[swift-evolution] Proposal - Allow properties in Extensions

[Chris Lattner]

> On Dec 8, 2015, at 10:51 AM, Kevin Kachikian via swift-evolution <swift-evolution at swift.org> wrote:
> 
> I’d like to proposal to the Swift community and discuss the advantages and disadvantages of adding modifiable properties to extensions (in addition to the already existing computed properties, instance methods, subscripts, etc.):
> 
> extension SomeType {
> 	
> 	var aNewProperty: Int
> 	var anotherVariable: String
> 	var aThirdOne: MyStruct

IMO, this is a generally desirable thing.  It would be great to replace the need to use objc_setAssociatedObject with proper language support.  That said, the exact semantics and implementation details are unclear, so we’d need a specific detailed proposal.

-Chris
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