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Como detectar se \thepage está indefinido?

tag-icon • tag-icon conditionals page-numbering incompatibility
Como detectar se \thepage está indefinido?

Osig-alternateclass por padrão desativa os números de página, que quebram mparhack(entre outras coisas).

Como posso incluir o código tex somente se \thepageestiver definido corretamente? Eu tentei \ifcsnamee \ifcsemptyde etoolbox, mas nenhum funcionou.

MWE:

\documentclass{sig-alternate}

%\pagenumbering{arabic}

\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}

\usepackage{mparhack}

\begin{document}

\title{A Sample {\ttlit ACM} SIG Proceedings Paper in LaTeX}

\numberofauthors{1} 
\author{
\alignauthor
Ben Trovato\titlenote{Dr.~Trovato insisted his name be first.}\\
       \affaddr{Institute for Clarity in Documentation}\\
       \affaddr{1932 Wallamaloo Lane}\\
       \affaddr{Wallamaloo, New Zealand}\\
       \email{[email protected]}
}
\date{30 July 1999}

\maketitle

\section{Introduction}

The \textit{proceedings} are the records of a conference.
\end{document}

Responder1

Usar \@ifundefined:

\documentclass{sig-alternate}
%\pagenumbering{arabic}

\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}

\usepackage{mparhack}

\makeatletter
\@ifundefined{thepage}{\def\thepage{\arabic{page}}}{}%
\makeatother

\begin{document}
\title{A Sample {\ttlit ACM} SIG Proceedings Paper in LaTeX}

\numberofauthors{1}
\author{
\alignauthor
Ben Trovato\titlenote{Dr.~Trovato insisted his name be first.}\\
       \affaddr{Institute for Clarity in Documentation}\\
       \affaddr{1932 Wallamaloo Lane}\\
       \affaddr{Wallamaloo, New Zealand}\\
       \email{[email protected]}
}
\date{30 July 1999}

\maketitle

\section{Introduction}

The \textit{proceedings} are the records of a conference.
\end{document}

Funciona com ou sem \pagenumbering{arabic}.

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