conditional usepackage given documentclass [duplicate]

Possible Duplicate:
Which document class is being used?

How would I conditionally `usepackage{enumitem}` if the document class is memoir (but not beamer)?

Could I use the etoolbox primitives, or do I have to define something using renewcommand?

My setup is that I have two documents — `memoir` document, and a `beamer` document — both including the same latex document, which does most of the includes.

• @PeterGrill: I've edited the question. – Neil G Sep 26 '12 at 2:00
• Ah, thanks! Sorry, I did some searching, but didn't find this! – Neil G Sep 26 '12 at 2:00
• Thats ok. If you couldn't easily find it most likely others won't either, so having dupes helps to locate things. – Peter Grill Sep 26 '12 at 2:01