/**
 * Returns an instance of the GFHighrise class
 *
 * @see    GFHighrise::get_instance()
 * @return object GFHighrise
 */
function gf_highrise()
{
    return GFHighrise::get_instance();
}
 /**
  * Get instance of this class.
  *
  * @since  1.0
  * @access public
  * @static
  *
  * @return $_instance
  */
 public static function get_instance()
 {
     if (null === self::$_instance) {
         self::$_instance = new self();
     }
     return self::$_instance;
 }