Redirect with if statement

Hi

I want to redirect from one page to another with the help of if statement in functions.php

I am doing this for buddypress. Here is what I want :

if user is logged in and is on link “/notifications” then redirect to

“<?php bp_loggedinuser_link() ?>/notifications”

What I am trying to do is make a single link for buddypress dynamic links. So, if someone goes to “/notifications” he would be redirected to if own notifications page.

Can anybody tell me that how to write the above in form of code?

Thanks