Hi, quick question here: I have a class with a property that needs to be really *really* lazy. So lazy, in fact, that when you assign to that property, the class actually stores a closure of what you assigned, which is only evaluated if and when you actually attempt to read the property.
Simplified: class Foo { private var valueSource: () -> Bar private var valueCache: Bar? init(_ v: @escaping @autoclosure () -> Bar) { valueSource = v } var value: Bar { get { if let v = valueCache { return v } let w = valueSource() valueCache = w return w } set { /* ??? */ } } // I want this function's logic to go in the setter above func setValue(_ v: @escaping @autoclosure () -> Bar) { valueSource = v valueCache = nil } } The goal is to be able to write things like “someFoo.value = bar1 / bar2” (or even more complex expressions) and not evaluate them until/unless the result is actually needed. Currently I am using “someFoo.setValue( bar1 / bar2 )”, which is not nearly as ergonomic as the assignment syntax. So, is there a way to make this work? Nevin
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