uri_segments problem

[eluser]Unknown[/eluser]
hi,

I think that is a bug.
look my source controllers/first.php

Code:

function index()
{
$this->load->helper('url');
$data['switch'] = uri_segments();
$this->load->view('first',$data);    
}

then I get error with:
Fatal error: Call to undefined function uri_segments() in C:\wamp\www\system\application\controllers\first.php on line 20