import Cocoa
protocol AnimalFeed {
static func grow() -> Self
}
protocol Animal {
associatedtype Feed: AnimalFeed
func eat(_ food: Feed)
}
struct Hay: AnimalFeed {
static func grow() -> Self {
print("growing hay")
return Hay()
}
}
struct Pellet: AnimalFeed {
static func grow() -> Self {
print("growing pellets")
return Pellet()
}
}
struct Horse: Animal {
func eat(_ food: Hay) {
print("horse eating \(food)")
}
}
struct Dog: Animal {
func eat(_ food: Pellet) {
print("dog eating \(food)")
}
}
struct Farm {
func feed(_ animal: some Animal) {
let food = type(of: animal).Feed.grow()
animal.eat(food)
}
func feedAll(_ animals: [any Animal]) {
for animal in animals {
feed(animal)
}
}
}
let animals: [any Animal] = [
Horse(),
Horse(),
Dog(),
]
let farm = Farm()
farm.feedAll(animals)
according to the video, that should compile...
aside: I opened the forum post creator from the Embrace Swift Generics video, which added the tag for the video, so I assumed it would signal which video I was talking about, but I guess the forum is not very useful in that regard
