Suppose I'm writing a foo class which at some point calls
LoadClassWithOptions{book}
I would like to be able to pass either oneside or twoside to the book class based on various other considerations. Is there a way to explicitly set the option prior to calling LoadClassWithOptions or do I have to use LoadClass and pass the appropriate option explicitly?
\PassOptionsToClass, which seems to be what you want: you set those up, then just do\LoadClass, and only those options you've requested get forwarded. – Joseph Wright Sep 30 '14 at 07:56