Structural Food Typing

  abstract class Dickmacher {}
  case class Beverage (name: String, cal: Int) extends Dickmacher
  case class Food (name: String, cal: Int) extends Dickmacher
  case class Meal (name: String, food: Food, drink: Beverage) extends Dickmacher
  case class Combo (starter: Dickmacher, main: Dickmacher) extends Dickmacher

  //hat wie Food einen val 'cal', erbt aber nicht von Dickmacher
  class Elephant(val cal: Int) {
    override def toString() : String = "Elephant"
  }

  
  class Person(name: String) {
      def eat(food: Food) = {
          println("Ich habe " + food + " mit " + food.cal + " cal gegessen.")
      }
  }
  
  val person = new Person("Horst") 
  person.eat(Food("Diatschokolade", 5))
//  person.eat(new Elephant(500000)) compile error
  

  
  class Allesfresser(name: String) {
      def eat(food: { def cal : Int}) = {
          println("Ich habe " + food + " mit " + food.cal + " cal gegessen.")
     }
  }
  
  val allesFresser = new Allesfresser("Anna")
  allesFresser.eat(Food("Schnitzel", 400))
  allesFresser.eat(new Elephant(500000))