[swift-evolution] [Draft][Proposal] Formalized Ordering
dabrahams at apple.com
Fri Jul 22 21:55:24 CDT 2016
on Fri Jul 22 2016, Brent Royal-Gordon <brent-AT-architechies.com> wrote:
>> On Jul 22, 2016, at 7:23 PM, Dave Abrahams <dabrahams at apple.com> wrote:
>> No, NSString's conformance to Identifiable (probably NSObject's,
>> actually) would define `===` in terms of `isEqual()`. That's saying
>> identity for these types is determined by `isEqual()`.
> So `===` no longer tests if both instances are the same?
In a very real sense, it does test exactly that. It no longer tests if
there's only one instance behind the two references.
> What's the way to do that now—`ObjectIdentifier(lhs) ==
That's how you test if there's really only one instance.
> (Should it still be called "Identifier" if we're taking the term
> "identifiable" for something else?
> Do we need to change the general term "identity", as in "instances of
> reference types have an identity"?)
Good questions; we should keep them in mind as we figure out the naming.
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