How use custom libraries in Kohana 3

I am trying to include a user library that includes some user related functions such as checking if the user is authenticated and such. Now I am trying to make usage of the Kohana autoloader, but can't seem to get it working.

I have the library placed under application/classes/library

class User {
 public function is_alive()
 {
   $session开发者_Python百科 = Session::instance();
   $data = $session->get('alive');

   if(isset($data))
   {
    return true;
   }
   else
   {
    return false;
   }
 }
}

And I try to call the library with

$user = new User;

But it doesn't seem to do the trick.

How can I call a custom library?

---

I have the library placed under application/classes/library

Place the library in /application/classes/.

Otherwise, you have to place this in your controller:

public function before() {
    require Kohana::find_file('classes', 'library/User');
}

You can read about this here.

Now you can do the same as before, with User.php inside the directory library.