tasks a-s

Task/Polymorphism/Lua/polymorphism.lua

@@ -0,0 +1,29 @@
+-- Point
+local Point = {x = 0, y = 0}
+
+function Point:new(o)
+    o = o or {}
+    setmetatable(o, self)
+    self.__index = self
+    return o
+end
+
+function Point:print()
+    print("Point(" .. self.x .. ", " .. self.y .. ")")
+end
+
+function Point:copy()
+    return Point:new{x = self.x, y = self.y}
+end
+
+-- Circle
+local Circle = Point:new()
+Circle.r = 0
+
+function Circle:print()
+    print("Circle(" .. self.x .. ", " .. self.y .. ", " .. self.r .. ")")
+end
+
+function Circle:copy()
+    return Circle:new{x = self.x, y = self.y, r = self.r}
+end