tasks a-s

Task/Polymorphic-copy/D/polymorphic-copy-1.d

@@ -0,0 +1,19 @@
+class T {
+    override string toString() { return "I'm the instance of T"; }
+    T duplicate() { return new T; }
+}
+
+class S : T {
+    override string toString() { return "I'm the instance of S"; }
+
+    override T duplicate() { return new S; }
+}
+
+void main () {
+    import std.stdio;
+    T orig = new S;
+    T copy = orig.duplicate();
+
+    writeln(orig);
+    writeln(copy);
+}