> Am 24.06.2016 um 07:59 schrieb J. Charles M. N. via swift-evolution > <[email protected]>: > > Doesn't Optional.None allready a placeholder for null values in swift?
Not really. What is the type of Optional.none? `let empty = Optional.none` does not compile, it says "Generic parameter 'Wrapped' could not be inferred". NSNull() is a unique concrete value, and it's compatible with Objective C, NSObject and AnyObject. We could of course use `Optional<Int16>.none`, but someone else may use `Optional<AnyObject>.none` instead. The extra type information is just misleading in this case. > > I read some where that nil was the new way to represent null pointer in > swift. It is, usually. But does it work in this case? -Michael > > -- > J. Charles > >> Le 24 juin 2016 à 00:59, Michael Peternell via swift-evolution >> <[email protected]> a écrit : >> >> I think NSNull() should be used, not a struct. I don't think that a struct >> would be more performant. Or maybe the performance doesn't matter at all in >> any real-world usage scenario. But you may write a benchmark of a realistic >> (!) use-case (!) if you think otherwise... would be interesting to see the >> results. >> >> Keeping with NSNull() also simplifies objc-interoperability. >> >> -Michael >> >>> Am 23.06.2016 um 06:14 schrieb Alsey Miller via swift-evolution >>> <[email protected]>: >>> >>> Add a struct Null to the Swift 3.0 Foundation value types. As a struct, >>> Null is more performant (no ARC or memory allocation) than NSNull, and will >>> be needed for Swift JSON decoders and libraries that want to use struct >>> value types, and be free from classes for their model layer. >>> >>> >>> Coleman, >>> >>> >>> >>> >>> >>> _______________________________________________ >>> swift-evolution mailing list >>> [email protected] >>> https://lists.swift.org/mailman/listinfo/swift-evolution >> >> _______________________________________________ >> swift-evolution mailing list >> [email protected] >> https://lists.swift.org/mailman/listinfo/swift-evolution > _______________________________________________ > swift-evolution mailing list > [email protected] > https://lists.swift.org/mailman/listinfo/swift-evolution _______________________________________________ swift-evolution mailing list [email protected] https://lists.swift.org/mailman/listinfo/swift-evolution
