From 9d58850d63b2b4dc829215985a66c018fdc9c94f Mon Sep 17 00:00:00 2001
From: Mark Nelson <markn@moodle.com>
Date: Thu, 25 Jul 2013 13:53:45 +0800
Subject: [PATCH] Changed the render function to abstract as it is required by
 all elements

---
 element/element.class.php | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/element/element.class.php b/element/element.class.php
index 0928ce0..a7e6959 100644
--- a/element/element.class.php
+++ b/element/element.class.php
@@ -173,9 +173,7 @@ abstract class customcert_element_base {
      * @param pdf $pdf the pdf object
      * @param bool $preview true if it is a preview, false otherwise
      */
-    public function render($pdf, $preview) {
-        // Must be overridden.
-    }
+    public abstract function render($pdf, $preview);
 
     /**
      * Common behaviour for rendering specified content on the pdf.