Problems with output cache

[eluser]davste[/eluser]
Hi,

I use the Output cache method on some of my pages:
$this->output->cache (60);

This works fine, but whenever the user logs out the system, and accesses the restricted page, the function's constructor won't redirect him. The thing that happens is that the Output Class will get the Cache file and display that.

Code:

class Restricted_page extends Controller {

public function __constructor ()
{
    parent::Controller();

    if ($this->Authentication->login_validation() === FALSE) {
        redirect ();
    }
}

public function index ()
{
    $this->output->cache (30);

    $this->load->view ('admin_index');
}
}

This is just an example code, but gives you an idea. Instead of being redirected by the Constructor, the cached page will show.. I want the constructor to run, and THEN load the content from cache, if the user is logged in!