ObjectIdentifier(self).hashValue is a decent approach; it hashes based upon the
pointer address. That is how swift-corelibs-foundation does it for the swift
implementation of NSObject:
https://github.com/apple/swift-corelibs-foundation/blob/master/Foundation/NSObject.swift#L94
> On Oct 5, 2016, at 9:53 AM, Travis Griggs via swift-users
> <swift-users@swift.org> wrote:
>
> I have a class that I’d rather not have based off of NSObject, but I do want
> to have identity based equality. I’ve done that as follows:
>
> class Foobar { }
>
> extension Foobar:Equatable { }
>
> func == (a:Foobar, b:Foobar) -> Bool {
> return a === b
> }
>
> What’s less clear to me is how to go about implementing an identity based hash
>
> extension Foobar:Hashable {
> var hashValue:Int {
> // what magic should happen here?
> }
> }
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