Document Classes ⇒ Writing Classes with conditionals...

[nima]

I know this has come up before in various forms, such as those in http://www.latex-community.org/forum/vi ... f=5&t=2060, however I think what I'm facing is either different, or I'm not smart enough to figure it out - which is entirely possible :)

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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\DeclareOption{xray}{
    %....code that requires package color and multicol...
}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\ProcessOptions\relax
\LoadClassWithOptions{article}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\RequirePackage{optional}
%...
\IfDeclaredOption{xray}{% A construct such as this is what I'm after
    \RequirePackage{multicol}
    \RequirePackage[usenames,dvipsnames]{color} %. Thanks David Carlisle
}

I can't place

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\RequirePackage 

inside the

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\DeclareOption

obviously.

I've tried optional, comment, and the ifx packages, and have failed to get this working, mainly because they don't seem to compile correctly if I try and use them after the Options section of the LaTeX document.

[josephwright]

This has been answered on c.t.t. Pleas mention when you cross-post questions in different forums.

[nima]

I posted there after here actually - but you make a perfectly valid point. I'll make sure I do that next time.