<?php defined('SYSPATH') or die('No direct access allowed.');
/**
* This interface ensures that all cart processing objects have the right methods
*
* @package Cart
* @category Interface
* @author Deon George
* @copyright (c) 2009-2013 Open Source Billing
* @license http://dev.osbill.net/license.html
*/
interface Cartable {
// Render a cart line item.
public function cart_item();
// Return if this invoice is already in the cart
public function cart_exists();
}
?>
