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<a name="Macro-features"></a>
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Next: <a href="Tokens.html#Tokens" accesskey="n" rel="next">Tokens</a>, Previous: <a href="FWEB-macros.html#FWEB-macros" accesskey="p" rel="prev">FWEB macros</a>, Up: <a href="FWEB-macros.html#FWEB-macros" accesskey="u" rel="up">FWEB macros</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="Various-features-of-FWEB-macros"></a>
<h4 class="subsection">7.2.1 Various features of <small>FWEB</small> macros</h4>
<blockquote>
<ul>
<li> Fundamentally, <small>FWEB</small> macros follow the syntax for ANSI C. There are
also a few extensions, notably the possibility of variable (optional) arguments
(see <a href="Variable-arguments.html#Variable-arguments">Variable arguments</a>) and some additional preprocessing tokens
(see <a href="Tokens.html#Tokens">Tokens</a>).
</li><li> Adjacent strings in macro text are automatically concatenated.
</li></ul>
</blockquote>
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<tr><th colspan="3" align="left" valign="top"><pre class="menu-comment">
EXTENSIONS of ANSI-C MACRO SYNTAX
</pre></th></tr><tr><td align="left" valign="top">• <a href="Variable-arguments.html#Variable-arguments" accesskey="1">Variable arguments</a>:</td><td> </td><td align="left" valign="top"><small>FWEB</small> macros with variable arguments.
</td></tr>
<tr><td align="left" valign="top">• <a href="Recursion.html#Recursion" accesskey="2">Recursion</a>:</td><td> </td><td align="left" valign="top"><small>FWEB</small> macros may be recursive (proceed at your own risk).
</td></tr>
<tr><td align="left" valign="top">• <a href="Macro-protection.html#Macro-protection" accesskey="3">Macro protection</a>:</td><td> </td><td align="left" valign="top">Protecting <small>FWEB</small> macros against redefinition.
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</pre></th></tr></table>
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