Extend Code Igniter with a library or helper ?

[eluser]T-productions[/eluser]
Hi everyone,

I would like to memorize which controller or url is called by user to have

Code:

$this->router->fetch_class();
$this->router->fetch_method();

I don't know how can I organize this, in an helper or a library ?

Sorry I begin with Code Igniter and especially its organization.

Thanks for your help