“SwiftData inheritance relationship”

That's really not a solution to anything, and the whole idea of adding junk dummy protocols around your project just to work around the type system is really abhorrent to me.That dummy protocol is a guarantee of nothing. Anybody could add comformance to that protocol, and then totally defeat the type constraints I've built in to my components. I would need to flesh out that protocol with the specific methods I need (like removeFromSuperview), and I'd need to write shims for every method I need which accepts a concrete type and relies on inheritance for specialisation. Essentially, I would need to rewrite UIView as a protocol. And even then it would be horribly unsafe - somebody could just go ahead and write:extension String : ViewMaster {}and then they'd defeat all of your type guarantees and lose all of the information that those type constraints give.In this case, you might know never to make String conform to ViewMaster. In other cases, you might not be aware of all of the implications of that con

junk dummy protocols are actually known as marker protocols. They won't be necessary when Swift allows us to extend existing type with attributes.I don't know what you mean by this:Anybody could add comformance to that protocol, and then totally defeat the type constraints I've built in to my components. I would need to flesh out that protocol with the specific methods I need (like removeFromSuperview), and I'd need to write shims for every method I need which accepts a concrete type and relies on inheritance for specialisation.No programming language yet provides the amount of static analysis necessary for everyone's needs.

You can constrain it to your own protocol type, but if you want to append you (as noted by OOPer) have to create the right type to append. Unless your protocol includes an init or some other method that returns Self there is no way for you to do that. IntegerType DOES have such a method: it inherits from IntegerLiteralConvertible, so the integer literals you were appending could be constructed as the correct type depending on whether, for example, the array was [Int] or [UInt8] or whatever.

I have tried this:extension Optional: HashValue where T: Hashable { func hashValue() -> Int { switch self { case let .Some(t): return t.hashValue case .None: return 1 } } }But that gives the error:Extension of type 'Optional' with constraints cannot have an inheritance clauseDid you have something else in mind.

In the old version of the forums, a user posted the answer they got from Developer Support:https://devforums.apple.com/message/1067418#1067418 Location relevant Apps are recommended on the lock screen and in the App Store based on a number of factors, including their popularity at the location, and there is no mechanism or process by which an App developer can add their App to the list of recommended Apps. However, if your iOS App is directly related to the location or venue (such as a mall guide iOS App which is published by the mall owner or operator), and you believe your iOS App’s relevance warrants it being included the list of recommended Apps, then you are encouraged to submit an enhancement request via http://bugreport.apple.com/, and request that Apple consider whether your iOS App should be included in the list of recommended Apps for that location. You should provide as much detail in the ’enhancement request' about the App and venue/location as possible, such as the App ID, App Name, URL to the Ap

To be honest I stay away from blocks as I don't understand them fully.over here what should be my arguments to the block if the entity i am evaulating is A and the relation object is Date.date. so basically i want all A who have relationship Date's attribute date having year 1998 (for example)

You do exactly what you'd do in any other case:Create a new relationship on Match, and specify that the type is Match.Naturally, you'll want to specify that the relationship is optional (since not every Match will have a next winner match or a next loser match).If tracking the inverse of the four different destination matches is inconvenient, don't specify an inverse for those relationships.

I think there's more going on here than you think.What you're really asking for is inheritance, which currently does not exist for value types. Protocol extensions are vaguely similar to inheritance in some ways, but not currently so far as to allow you to have default stored properties.You could use inheritance if your columns were classes instead of structs. Indeed, in this case, I think it's clear that your columns should be classes instead of structs. Generally, structs are inappropriate when their value represents the state of some thing, whether it's a real world object or a specific entity like a column (presumable of some table or list). In this case, a particular column has one true name, presumably along with other one true properties that you haven't shown us. If the column's one true state is immutable, it doesn't really matter whether it's a value type or a reference type, but if it's mutable as yours seems likely to be, then it's almost certainly better to use a refere

I assume you have a way to get to the SKSpriteNode for each monster. To adjust the z-value, you'd set the node's zPosition property. (The zPosition is not inherited by sub-nodes, so if there are any visible sub-nodes, you'll have to adjust their zPositions also.)The easiest thing to do might be simply to set the zPosition to -position.y. That will make the nodes towards the top of the scene far away, and nodes towards the bottom nearer. Of course, any nodes behind the monsters would then need to have a zPosition farther away than any of them.If you wanted a tighter spread of zPosition, just sort the monsters by position.y and give the monster at index i a zPosition of monsters.count - i. (You can multiply by 5 or something if you want each monster to have a range of zPositions so that subnodes can be displayed properly relative to each other.)