lstlining changing font in moredelim

Question

lstlisting is not using the identifierstyle font inside of the moredelim that makes the identifier name red. In the example, the first varname is in tt font but the second is in roman. I want the second varname to also be in tt font but red. What am I doing wrong?

\documentclass{article}
\usepackage{listings}
\usepackage{color}

\lstset{
language=C++,
identifierstyle={\texttt},
moredelim=**[is][\color{red}]{@}{@},
}% lstset

\begin{document}
\begin{lstlisting}
varname
@varname@
\end{lstlisting}
\end{document}

Answer 1

Add \ttfamily:

\documentclass{article}
\usepackage{listings}
\usepackage{color}

\lstset{
language=C++,
identifierstyle={\texttt},
moredelim=**[is][\color{red}\ttfamily]{@}{@},
}% lstset

\begin{document}
\begin{lstlisting}
varname
@varname@
\end{lstlisting}
\end{document}