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Next: <a href="Macro-protection.html#Macro-protection" accesskey="n" rel="next">Macro protection</a>, Previous: <a href="Variable-arguments.html#Variable-arguments" accesskey="p" rel="prev">Variable arguments</a>, Up: <a href="Macro-features.html#Macro-features" accesskey="u" rel="up">Macro features</a> [<a href="Parameter-index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-index.html#Concept-index" title="Index" rel="index">Index</a>]</p>
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<a name="Recursion-1"></a>
<h4 class="subsubsection">7.2.1.2 Recursion</h4>
<a name="index-Recursion"></a>
<p>ANSI C does not permit recursive macros (for good reason). Thus, in the
example
</p>
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<pre class="example">@m recurse recurse
</pre></div>
<p>the identifier <code>recurse</code> simply expands as ‘<code>recurse</code>’, not as
an infinite loop. However, in <small>FWEB</small> recursion may be useful in
conjunction with some of the built-in functions
(see <a href="Built_002din-functions.html#Built_002din-functions">Built-in functions</a>). To permit a macro to be recursive, say ‘<samp>@m*</samp>’.
</p>
<p><em>No formal support is provided for recursive macros!</em> If they
don’t work, or suddenly stop working in a new release, <em>you’re on
your own</em>!
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