/**
* Public function that creates a single instance
*/
public static function get_instance($parent)
{
if (!isset(self::$_instance)) {
self::$_instance = new self($parent);
}
return self::$_instance;
}
/**
* Constructor
*/
protected function __construct()
{
global $section;
parent::__construct(__FILE__);
if (class_exists('shop')) {
require_once 'units/method.php';
$delivery = Duki_DeliveryMethod::get_instance($this);
}
}
