%%\ProvidesFile{standalone.tex}[2010/02/28 v0.4 Provides if-switch to show if file is compiled standalone]%
\expandafter\ifx\csname ifstandalone\endcsname\relax
\expandafter\newif\csname ifstandalone\endcsname
\expandafter\ifx\csname @twoclasseserror\endcsname\documentclass
\else
  \standalonetrue
\fi
\fi
