Remember an class option with newcommand and CurrentOption

Question

I'm trying to make a class but it needs to remember its arguments

I'm using the file

\documentclass[x]{test}

\begin{document}
\end{document}

With the class

\NeedsTeXFormat{LaTeX2e}
\ProvidesClass{test}[2015/01/15 test class]

\DeclareOption*{
  \newcommand{\test}{y}
  \typeout{\test}
}

\ProcessOptions\relax

\typeout{\test}

\endinput

It outputs

 y
 y

which is good but that's not what I want to do.

With the class

\NeedsTeXFormat{LaTeX2e}
\ProvidesClass{test}[2015/01/15 test class]

\DeclareOption*{
  \newcommand{\test}{\CurrentOption}
  \typeout{\test}
}

\ProcessOptions\relax

\typeout{\test}

\endinput

I get

x
<- empty line

It like it does not "dereference" \CurrentOption and take its string value so for the second \typeout, \CurrentOption is not defined to anything anymore and I get an empty value :( Does anyone know how to "dereference" it ? :)

Answer 1

You can use \let to make \test have the definition of \CurrentOption rather than reference it:

\documentclass[jjj]{test}

\stop

with class

\NeedsTeXFormat{LaTeX2e}
\ProvidesClass{test}[2015/01/15 test class]

\DeclareOption*{%
  \let\test\CurrentOption
  \typeout{\test}%
}

\ProcessOptions\relax

\typeout{\test}

\endinput