[swift-evolution] Proposal: Weak Native Swift Containers

[Chris Lattner]

> On Dec 10, 2015, at 4:08 PM, John McCall via swift-evolution <swift-evolution at swift.org> wrote:
> 
>> On Dec 10, 2015, at 3:31 PM, Riley Testut via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> wrote:
>> Using box types solves the portability problems, but it still means O(n) access for clients who want to access the non-boxed values directly. Additionally, these objects aren’t automatically removed from the collection when their values are nil-ed out, which is unfortunate.
>> 
>> Side note: this is the route I originally tried to take, but unfortunately the Swift doesn’t work well with weak references to protocol types…
> 
> Really?  Please file a bug about this; I’ve been working in this area recently.

It should work with protocols, but they must be class bound.

-Chris
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