Better Strategies Through Types
We have to limit our delegate to
classimplementations because delegates are assumed to hold mutable state.[…]
So rather than holding our strategy’s implementation in instance methods that need to be instantiated, we’re going to move it all up into type methods on the type.
[…]
If all this
.Typeand.selfstuff feels a little awkward, it’s probably because Swift already supports this kind of thing as a language feature. It has a specific syntax just for passing around types that are used to specialize implementations. We know it as “generics”.
However, a key difference is that, unlike delegates, the type cannot change at runtime.
