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Next: <a href="Extra-Reentrant-Argument.html#Extra-Reentrant-Argument" accesskey="n" rel="next">Extra Reentrant Argument</a>, Previous: <a href="Reentrant-Detail.html#Reentrant-Detail" accesskey="p" rel="prev">Reentrant Detail</a>, Up: <a href="Reentrant-Detail.html#Reentrant-Detail" accesskey="u" rel="up">Reentrant Detail</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Indices.html#Indices" title="Index" rel="index">Index</a>]</p>
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<a name="Declaring-a-Scanner-As-Reentrant"></a>
<h4 class="subsection">19.4.1 Declaring a Scanner As Reentrant</h4>
<p>%option reentrant (–reentrant) must be specified.
</p>
<p>Notice that <code>%option reentrant</code> is specified in the above example
(see <a href="Reentrant-Example.html#Reentrant-Example">Reentrant Example</a>. Had this option not been specified,
<code>flex</code> would have happily generated a non-reentrant scanner without
complaining. You may explicitly specify <code>%option noreentrant</code>, if
you do <em>not</em> want a reentrant scanner, although it is not
necessary. The default is to generate a non-reentrant scanner.
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