CDE

Task/Delegates/D/delegates-2.d

@@ -0,0 +1,29 @@
+import tango.io.Stdout;
+
+class Delegator
+{
+    private char[] delegate() hasDelegate;
+public:
+    char[] operation() {
+        if (hasDelegate is null)
+            return "default implementation";
+        return hasDelegate();
+    }
+
+    typeof(this) setDg(char[] delegate() dg)
+    {
+        hasDelegate = dg;
+        return this;
+    }
+}
+
+int main(char[][] args)
+{
+    auto dr = new Delegator();
+    auto thing = delegate char[]() { return "delegate implementation"; };
+
+    Stdout ( dr.operation ).newline;
+    Stdout ( dr.operation ).newline;
+    Stdout ( dr.setDg(thing).operation ).newline;
+    return 0;
+}