new tasks

Task/Delegates/PHP/delegates.php

@@ -0,0 +1,25 @@
+class Delegator {
+  function __construct() {
+    $this->delegate = NULL ;
+  }
+  function operation() {
+    if(method_exists($this->delegate, "thing"))
+      return $this->delegate->thing() ;
+    return 'default implementation' ;
+  }
+}
+
+class Delegate {
+  function thing() {
+    return 'Delegate Implementation' ;
+  }
+}
+
+$a = new Delegator() ;
+print "{$a->operation()}\n" ;
+
+$a->delegate = 'A delegate may be any object' ;
+print "{$a->operation()}\n" ;
+
+$a->delegate = new Delegate() ;
+print "{$a->operation()}\n" ;