%%
%% The LaTeX Companion, 3ed
%%
%% Example 4-2-41 on page I-321 in "Inline verbatim material in dangerous places".
%%
%% Copyright (C) 2022 Frank Mittelbach
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3c
%% of this license or (at your option) any later version.
%%
%% See https://www.latex-project.org/lppl.txt for details.
%%

\documentclass{tlc3exa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{183.0pt}
%StartShownPreambleCommands
\usepackage{fancyvrb}
%StopShownPreambleCommands

\begin{document}
\DefineShortVerb[fontsize=\tiny]{\|}
The use of |\DefineShortVerb| can make sources
much more readable---or unreadable!

\UndefineShortVerb{\|}\DefineShortVerb{\+}
\fvset{fontfamily=courier}
And with  +\UndefineShortVerb{\|}+
we can return the +|+ character back to normal.
\end{document}