class Sabre_CardDAV_Backend_Std extends Sabre_CardDAV_Backend_Abstract
{
+ /**
+ * @var null|Sabre_CardDAV_Backend_Std
+ */
+ private static $instance = null;
+
+ /**
+ * @static
+ * @return Sabre_CardDAV_Backend_Std
+ */
+ public static function getInstance() {
+ if (self::$instance == null) {
+ self::$instance = new Sabre_CardDAV_Backend_Std();
+ }
+ return self::$instance;
+ }
+
+
/**
* Sets up the object
*/