> 在 2016年7月18日，02:08，Dmitri Gribenko <[email protected]> 写道： > > On Sun, Jul 17, 2016 at 2:00 AM, 张国晔 via swift-evolution > <[email protected]> wrote: >> I'm building an document-based app, and I'm having a problem regarding to >> Set. >> >> What I hope to achieve is to have a Set of unique objects by their >> references. > > Try this: > > public final class ReferenceEqualityBox<Wrapped : Equatable> : Hashable { > public var value: Wrapped > public init(_ value: Wrapped) { > self.value = value > } > public var hashValue: Int { > return ObjectIdentifier(self).hashValue > } > } > public func == <Wrapped> ( > lhs: ReferenceEqualityBox<Wrapped>, > rhs: ReferenceEqualityBox<Wrapped> > ) -> Bool { > return ObjectIdentifier(lhs) == ObjectIdentifier(rhs) > } > > Dmitri > > -- > main(i,j){for(i=2;;i++){for(j=2;j<i;j++){if(!(i%j)){j=0;break;}}if > (j){printf("%d\n",i);}}} /*Dmitri Gribenko <[email protected]>*/
Thanks, I haven't thought of using ObjectIdentifier instead of unsafeAddress(of:). That's a lot better than my option 2. - Guoye Zhang _______________________________________________ swift-evolution mailing list [email protected] https://lists.swift.org/mailman/listinfo/swift-evolution
