Lets say I want to model a fantasy-game with protocol oriented programming in swift. the code below produces the following error:
Protocol 'Character' can only be used as a generic constraint because it has Self or associated type requirements
what's the problem here? how to do it right?
protocol Character: Identifiable {
var name: String {get}
var maxHealt: Int {get}
var healt: Int { get set }
}
extension Character {
var id: String {return name}
mutating func setHealth(newValue: Int) {
healt = newValue
}
}
protocol Fighter {
var attackPower: Int { get }
}
extension Fighter {
func attack(enemy: Character ) -> Character {
var enemy = enemy
enemy.setHealth(newValue: enemy.maxHealt - self.attackPower)
return enemy
}
}
You need to add generic constraints.
extension Fighter {
func attack<T: Character>(enemy: T ) -> T { //<-- Here
var enemy = enemy
enemy.setHealth(newValue: enemy.maxHealt - self.attackPower)
return enemy
}
}
Collected from the Internet
Please contact [email protected] to delete if infringement.
Comments