xoptarg – Expandable macros that take an optional argument
Commands that take an optional argument are not ordinarily expandable; this package allows such commands to be expandable provided that they have at least one mandatory argument.
The LaTeX Project Public License
|Contained in||TeX Live as xoptarg|
|MiKTeX as xoptarg|
alternative ways of defining macros
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Maybe you are interested in the following packages as well.
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