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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>24.6. Function EXT:FEATUREP [CLRFI-1]</title><link rel="stylesheet" href="impnotes.css" type="text/css" /><link rev="made" href="mailto:clisp-list@lists.sourceforge.net" /><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot_8465" /><link rel="home" href="index.html" title="Implementation Notes for GNU CLISP" /><link rel="up" href="system.html" title="Chapter 24. System Construction" /><link rel="prev" href="features.html" title="24.5. Variable *FEATURES*" /><link rel="next" href="compiled-file-p.html" title="24.7. Function EXT:COMPILED-FILE-P [CLRFI-2]" /><link rel="copyright" href="legalese.html" title="Legal Status of the CLISP Implementation Notes" /><meta name="date" content="'generated: 2009-07-28 12:48:49-04:00'" /><link rel="author" title="Authors" href="index.html#authors" /><link rel="contents" title="Table of Contents" href="index.html" /><link rel="glossary" href="glossary.html" /><link rel="help" href="faq.html#faq-help" title="How do I ask for help?" /><link rel="home" title="Home" href="http://clisp.cons.org" /><link rel="index" href="idx.html" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">24.6. Function <code class="function">EXT:FEATUREP</code> [CLRFI-1]</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="features.html">Prev</a> </td><th width="60%" align="center">Chapter 24. System Construction </th><td width="20%" align="right"> <a accesskey="n" href="compiled-file-p.html">Next</a></td></tr></table><hr /></div><div class="section" title="24.6. Function EXT:FEATUREP [CLRFI-1]"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="featurep"></a>24.6. Function <code class="function">EXT:FEATUREP</code>
<a class="ulink" href="http://clrfi.alu.org/clrfi/clrfi-1-featurep" target="_top">[CLRFI-1]</a></h2></div></div></div><p><code class="code">(EXT:FEATUREP <em class="replaceable"><code>form</code></em>)</code> provides run-time access to
the read-time conditionals <a class="clhs" href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/sec_2-4-8-17.html"><span class="data"><code class="literal">#+</code></span></a> and <a class="clhs" href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/sec_2-4-8-18.html"><span class="data"><code class="literal">#-</code></span></a>.
<em class="replaceable"><code>form</code></em> is a <a class="clhs" href="http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/sec_24-1-2-1.html">feature exression</a>.</p></div><div class="bookinfo"><hr /><table width="100%" summary="impnotes meta info"><th><td align="left">These notes document <a class="ulink" href="http://clisp.cons.org" target="_top"><span class="command"><strong>CLISP</strong></span></a> version 2.48</td><td align="right">Last modified: 2009-07-28</td></th></table></div><div class="custom-footer"><hr /><table width="100%"><tr><td align="left"><a href="http://clisp.cons.org"><img src="clisp.png" width="48" height="48" alt="[CLISP home]" /></a></td><td align="center"><a href="https://sourceforge.net/donate/index.php?group_id=1355"><img src="http://images.sourceforge.net/images/project-support.jpg" width="88" height="32" alt="[Support CLISP]" /></a></td><td align="right"><a href="https://sourceforge.net/projects/clisp"><img width="120" height="30" alt="[SourceForge]" src="http://sflogo.sourceforge.net/sflogo.php?group_id=1355&amp;type=12&amp;page=featurep" /></a></td></tr></table></div><hr /><form method="get" action="http://www.google.com/custom" target="_top"><table width="100%" border="0"><tr><td nowrap="nowrap" align="center"><input type="hidden" name="domains" value="clisp.cons.org;clisp.podval.org;www.lisp.org" /><label for="sbi" style="display: none">Enter your search terms</label><input type="text" name="q" size="50" maxlength="255" id="sbi" value="24.6. Function EXT:FEATUREP [CLRFI-1]" /><label for="sbb" style="display: none">Submit search form</label><input type="submit" name="sa" value="Google Search" id="sbb" /></td></tr><tr><td nowrap="nowrap" align="center"><input type="radio" name="sitesearch" value="" checked="1" id="ss0" /><label for="ss0" title="Search the Web"><small>Web</small></label><input type="radio" name="sitesearch" value="clisp.cons.org" id="ss1" /><label for="ss1" title="Search clisp.cons.org"><small>clisp.cons.org</small></label><input type="radio" name="sitesearch" value="clisp.podval.org" id="ss2" /><label for="ss2" title="Search clisp.podval.org"><small>clisp.podval.org</small></label><input type="radio" name="sitesearch" value="www.lisp.org" id="ss3" /><label for="ss3" title="Search www.lisp.org"><small>www.lisp.org</small></label><input type="hidden" name="client" value="pub-4445255502750357" /><input type="hidden" name="forid" value="1" /><input type="hidden" name="ie" value="UTF-8" /><input type="hidden" name="oe" value="UTF-8" /><input type="hidden" name="cof" value="GALT:#008000;GL:1;DIV:#336699;VLC:663399;AH:center;BGC:FFFFFF;LBGC:000000;ALC:0000FF;LC:0000FF;T:000000;GFNT:0000FF;GIMP:0000FF;LH:48;LW:48;L:http://clisp.cons.org/clisp.png;S:http://clisp.cons.org;FORID:1" /><input type="hidden" name="hl" value="en" /></td></tr></table></form><hr /><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="features.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="system.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="compiled-file-p.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">24.5. Variable <code class="varname">*FEATURES*</code> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> 24.7. Function <code class="function">EXT:COMPILED-FILE-P</code> [CLRFI-2]</td></tr></table></div></body></html>