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-<head>
-<title>UK TeX FAQ -- question label verbwithin</title>
-</head><body>
-<h3>Why doesn&rsquo;t verbatim work within ...?</h3>
-<p/>The LaTeX verbatim commands work by changing category codes. Knuth
-says of this sort of thing &ldquo;Some care is needed to get the timing
-right...&rdquo;, since once the category code has been assigned to a
-character, it doesn&rsquo;t change. So <code>\</code><code>verb</code> and
-<code>\</code><code>begin{verbatim}</code> have to assume that they are getting the
-first look at the parameter text; if they aren&rsquo;t, TeX has already
-assigned category codes so that the verbatim command doesn&rsquo;t have a
-chance. For example:
-<blockquote>
-<pre>
-\verb+\error+
-</pre>
-</blockquote><p>
-will work (typesetting &lsquo;<code>\</code><code>error</code>&rsquo;), but
-<blockquote>
-<pre>
-\newcommand{\unbrace}[1]{#1}
-\unbrace{\verb+\error+}
-</pre>
-</blockquote><p>
-will not (it will attempt to execute <code>\</code><code>error</code>). Other errors one
-may encounter are &lsquo;<code>\</code><code>verb</code> ended by end of line&rsquo;, or even the
-rather more helpful &lsquo;<code>\</code><code>verb</code> illegal in command argument&rsquo;. The
-same sorts of thing happen with <code>\</code><code>begin{verbatim}</code> ...
-<code>\</code><code>end{verbatim}</code>:
-<blockquote>
-<pre>
-\ifthenelse{\boolean{foo}}{%
-\begin{verbatim}
-foobar
-\end{verbatim}
-}{%
-\begin{verbatim}
-barfoo
-\end{verbatim}
-}
-</pre>
-</blockquote><p>
-provokes errors like &lsquo;File ended while scanning use of
-<code>\</code><code>@xverbatim</code>&rsquo;, as <code>\</code><code>begin{verbatim}</code> fails to see its
-matching <code>\</code><code>end{verbatim}</code>.
-<p/>This is why the LaTeX book insists that verbatim
-commands must not appear in the argument of any other command; they
-aren&rsquo;t just fragile, they&rsquo;re quite unusable in any command parameter,
-regardless of <a href="FAQ-protect.html"><code>\</code><code>protect</code>ion</a>. (The <code>\</code><code>verb</code>
-command tries hard to detect if you&rsquo;re misusing it; unfortunately, it
-can&rsquo;t always do so, and the error message is therefore not a reliable
-indication of problems.)
-<p/>The first question to ask yourself is: &ldquo;is <code>\</code><code>verb</code> actually
-necessary?&rdquo;.
-<ul>
-<li> If <code>\</code><code>texttt{<em>your text</em>}</code> produces the same result
- as <code>\</code><code>verb</code><code>+<em>your text</em>+</code>, then there&rsquo;s no need of
- <code>\</code><code>verb</code> in the first place.
-<li> If you&rsquo;re using <code>\</code><code>verb</code> to typeset a URL or email
- address or the like, then the <code>\</code><code>url</code> command from the
- <i>url</i> will help: it doesn&rsquo;t suffer from all the problems of
- <code>\</code><code>verb</code>, though it&rsquo;s still not robust;
- &rdquo;<a href="FAQ-setURL.html">typesetting URLs</a>&rdquo; offers advice here.
-<li> If you&rsquo;re putting <code>\</code><code>verb</code> into the argument of a boxing
- command (such as <code>\</code><code>fbox</code>), consider using the <code>lrbox</code>
- environment:
-<blockquote>
-<pre>
-\newsavebox{\mybox}
-...
-\begin{lrbox}{\mybox}
- \verb!VerbatimStuff!
-\end{lrbox}
-\fbox{\usebox{\mybox}}
-</pre>
-</blockquote><p>
-</ul>
-<p/>Otherwise, there are three partial solutions to the problem.
-<ul>
-<li> Some packages have macros which are designed to be responsive
- to verbatim text in their arguments. For example,
- the <i>fancyvrb</i> package defines a command
- <code>\</code><code>VerbatimFootnotes</code>, which redefines the <code>\</code><code>footnotetext</code> (and
- hence the <code>\</code><code>footnote</code>) commands in such a way that you can include
- <code>\</code><code>verb</code> commands in its argument. This approach could in
- principle be extended to the arguments of other commands, but it can
- clash with other packages: for example, <code>\</code><code>VerbatimFootnotes</code>
- interacts poorly with the <code>para</code> option to the <i>footmisc</i>
- package.
-<p/> The <i>memoir</i> class defines its <code>\</code><code>footnote</code> command so that
- it will accept verbatim in its arguments, without any supporting package.
-<li> The <i>fancyvrb</i> package defines a command <code>\</code><code>SaveVerb</code>,
- with a corresponding <code>\</code><code>UseVerb</code> command, that allow you to save
- and then to reuse the content of its argument; for details of this
- extremely powerful facility, see the package documentation.
-<p/> Rather simpler is the <i>verbdef</i> package, which defines a
- (robust) command which expands to the verbatim argument given.
-<li> If you have a single character that is giving trouble (in
- its absence you could simply use <code>\</code><code>texttt</code>), consider using
- <code>\</code><code>string</code>. <code>\</code><code>texttt{my<code>\</code><code>string</code>_name}</code>
- typesets the same as
- <code>\verb+my_name+</code>, and will work in the argument of a command. It
- won&rsquo;t, however, work in a moving argument, and no amount of
- <a href="FAQ-protect.html"><code>\</code><code>protect</code>ion</a> will make it work in
- such a case.
-<p/> A robust alternative is:
- <blockquote>
-<pre>
-\chardef\us=`\_
-...
-\section{... \texttt{my\us name}}
-</pre>
- </blockquote><p>
- Such a definition is &lsquo;naturally&rsquo; robust; the construction
- &ldquo;&lt;<i>back-tick</i>&gt;<code>\</code><code>&lt;<i>char</code></i>&gt;&rdquo; may be used for any
- troublesome character (though it&rsquo;s plainly not necessary for things
- like percent signs for which (La)TeX already provides
- robust macros).
-</ul>
-Documentation of both <i>url</i> and <i>verbdef</i> is in the
-package files.
-<dl>
-<dt><tt><i>fancyvrb.sty</i></tt><dd><a href="ftp://cam.ctan.org/tex-archive/macros/latex/contrib/fancyvrb.zip">macros/latex/contrib/fancyvrb</a> (<a href="ftp://cam.ctan.org/tex-archive/macros/latex/contrib/fancyvrb.tar.gz">gzipped tar</a>, <a href="http://www.tex.ac.uk/tex-archive/macros/latex/contrib/fancyvrb/">browse</a>)
-<dt><tt><i>memoir.cls</i></tt><dd><a href="ftp://cam.ctan.org/tex-archive/macros/latex/contrib/memoir.zip">macros/latex/contrib/memoir</a> (<a href="ftp://cam.ctan.org/tex-archive/macros/latex/contrib/memoir.tar.gz">gzipped tar</a>, <a href="http://www.tex.ac.uk/tex-archive/macros/latex/contrib/memoir/">browse</a>)
-<dt><tt><i>url.sty</i></tt><dd><a href="ftp://cam.ctan.org/tex-archive/macros/latex/contrib/misc/url.sty">macros/latex/contrib/misc/url.sty</a>
-<dt><tt><i>verbdef.sty</i></tt><dd><a href="ftp://cam.ctan.org/tex-archive/macros/latex/contrib/misc/verbdef.sty">macros/latex/contrib/misc/verbdef.sty</a>
-</dl>
-<p/><p>This question on the Web: <a href="http://www.tex.ac.uk/cgi-bin/texfaq2html?label=verbwithin">http://www.tex.ac.uk/cgi-bin/texfaq2html?label=verbwithin</a>
-</body>