September Morn Update

Task/Constrained-genericity/Crystal/constrained-genericity.crystal

@@ -0,0 +1,23 @@
+class Apple
+  def eat
+  end
+end
+
+class Carrot
+  def eat
+  end
+end
+
+class FoodBox(T)
+  def initialize(@data : Array(T))
+    {% if T.union? %}
+    {% raise "All items should be eatable" unless T.union_types.all? &.has_method?(:eat) %}
+    {% else %}
+    {% raise "Items should be eatable" unless T.has_method?(:eat) %}
+    {% end %}
+  end
+end
+
+FoodBox.new([Apple.new, Apple.new])
+FoodBox.new([Apple.new, Carrot.new])
+FoodBox.new([Apple.new, Carrot.new, 123])

Task/Constrained-genericity/Objeck/constrained-genericity.objeck

@@ -0,0 +1,21 @@
+use Collection.Generic;
+
+interface Eatable {
+  method : virtual : Eat() ~ Nil;
+}
+
+class FoodBox<T : Eatable> {
+  food : List<T>;
+}
+
+class Plum implements Eatable {
+  method : Eat() ~ Nil {
+    "Yummy Plum!"->PrintLine();
+  }
+}
+
+class Genericity {
+  function : Main(args : String[]) ~ Nil {
+    plums : FoodBox<Plum>;
+  }
+}