Doxygen is an automatic code documentation tool. Use one of several code documentation styles while coding. After you're done for the night, run Doxygen and be amazed as dozens of professional looking HTML pages are generated. Class diagrams, hierarchy lists, and much more. It also makes man pages and other things.

Installing Doxygen:

Get the handout: html pdf tex ps

Example Doxygen Config: [tutorial.cfg]

Example Code: [tutorial.h] Example Doxygen Output

Resources:
Doxygen's Website