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Example of type erasure with Pokemon
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class Thunder { } | |
class Fire { } | |
protocol Pokemon { | |
typealias PokemonType | |
func attack(move: PokemonType) | |
} | |
struct Pikachu: Pokemon { | |
typealias PokemonType = Thunder | |
func attack(move: Thunder) { print("️--------Thunder Attack") } | |
} | |
class Charmander: Pokemon { | |
typealias PokemonType = Fire | |
func attack(move: Fire) { print("-------Fire Attack") } | |
} | |
class Raichu: Pokemon { | |
typealias PokemonType = Thunder | |
func attack(move: Thunder) { print("-------Thunder Attack") } | |
} | |
class AnyPokemon<PokemonType>: Pokemon { | |
private let _attack: ((PokemonType) -> Void) | |
required init<U: Pokemon where U.PokemonType == PokemonType>(_ pokemon: U) { | |
_attack = pokemon.attack | |
} | |
func attack(type: PokemonType) { | |
return _attack(type) | |
} | |
} | |
let thunderAttack = Thunder() | |
let fireAttack = Fire() | |
let pikachu: AnyPokemon<Thunder> = AnyPokemon(Pikachu()) | |
let raichu: AnyPokemon<Thunder> = AnyPokemon(Raichu()) | |
let electricPokemon = [pikachu, raichu] | |
let charmander: AnyPokemon<Fire> = AnyPokemon(Charmander()) | |
for pokemon in electricPokemon { | |
pokemon.attack(thunderAttack) | |
} | |
charmander.attack(fireAttack) |
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Awesome! Did you ever build something with type erasure?