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<a name="Reentrant-Overview"></a>
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<p>
Next: <a href="Reentrant-Example.html#Reentrant-Example" accesskey="n" rel="next">Reentrant Example</a>, Previous: <a href="Reentrant-Uses.html#Reentrant-Uses" accesskey="p" rel="prev">Reentrant Uses</a>, Up: <a href="Reentrant.html#Reentrant" accesskey="u" rel="up">Reentrant</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="An-Overview-of-the-Reentrant-API"></a>
<h3 class="section">19.2 An Overview of the Reentrant API</h3>
<a name="index-reentrant_002c-API-explanation"></a>
<p>The API for reentrant scanners is different than for non-reentrant
scanners. Here is a quick overview of the API:
</p>
<ul>
<li><code>%option reentrant</code> must be specified.
</li><li> All functions take one additional argument: <code>yyscanner</code>
</li><li> All global variables are replaced by their macro equivalents.
(We tell you this because it may be important to you during debugging.)
</li><li> <code>yylex_init</code> and <code>yylex_destroy</code> must be called before and
after <code>yylex</code>, respectively.
</li><li> Accessor methods (get/set functions) provide access to common
<code>flex</code> variables.
</li><li> User-specific data can be stored in <code>yyextra</code>.
</li></ul>
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