Call CI library in my hook

[eluser]instantations[/eluser]
[quote author="instantations" date="1193360663"]I'm having the exact same problem. :-S Can't it be done and how?[/quote]

I've solved my problem. It seems you can't instantiate CI in a pre-controller hook, but you can do so in a post_controller_constructor hook and this is soon enough in the CI flow to do what I wanted to do (log a user automatically from a "remember me" cookie).