Impresión de látex barra simple, barra invertida r, barra invertida n

Quiero que la siguiente línea dentro de un archivo * .tex se imprima "tal cual":

while (tmp[0] == '\r' || tmp[0] == '\n') {tmp++;}

Cuando lo envuelvo en un comando \ verb como este:

\verb"while (tmp[0] == '\r' || tmp[0] == '\n') {tmp++;}"

no funciona, y obtengo:

! Undefined control sequence.

Todas las demás respuestas de Google sonentonces Complicado.

Seguramente, debe haber una manera fácil de hacer esto, ¿verdad? ¡Gracias!

EDITAR:

Aquí está el ejemplo de contador mínimo solicitado en los comentarios:

%%%%%%%%%%%%%%%%%%%%%%%%%%
% document class: beamer %
%%%%%%%%%%%%%%%%%%%%%%%%%%
\documentclass{beamer}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% no navigation bars please %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\setbeamertemplate{footline}[frame number]{}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% no navigation symbols please %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\setbeamertemplate{navigation symbols}{}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% no footers at all please %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\setbeamertemplate{footline}{}

%%%%%%%%%%%%%%%%%%%%%%%%%%%
% center the title please %
%%%%%%%%%%%%%%%%%%%%%%%%%%%
\setbeamertemplate{frametitle}[default][center]

%%%%%%%%%%%%%%%%%%
% begin document %
%%%%%%%%%%%%%%%%%%
\begin{document}

%%%%%%%%%
% title %
%%%%%%%%%
\title{Some Title}   

%%%%%%%%%%
% author %
%%%%%%%%%%
\author{Some Author}

%%%%%%%%%%%%
% date ... %
%%%%%%%%%%%%
\date{\today} 

%%%%%%%%%%%%%
% frame ... %
%%%%%%%%%%%%%
\frame{\titlepage} 

%%%%%%%%%%%%%%%%%%%%%%%%%%%
% SECTION :: Introduction %
%%%%%%%%%%%%%%%%%%%%%%%%%%%
\section{Section Introduction} 
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Frame Title :: Introduction %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\frame{\frametitle{Status}
%%%%%%%%%%%%%%%%%%
% Items :: Begin %
%%%%%%%%%%%%%%%%%%
\begin{itemize}
\item
while (tmp[0] == 'A' $||$ tmp[1] == 'B') $\{$tmp++;$\}$
\end{itemize}
}
\end{document}

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