<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>null-pointer-p</title><link rel="stylesheet" href="ecl.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.75.2"><link rel="home" href="index.html" title="The ECL manual"><link rel="up" href="rn03.html" title="Objects"><link rel="prev" href="rn03re64.html" title="make-null-pointer"><link rel="next" href="rn03re66.html" title="+null-cstring-pointer+"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><code class="function">null-pointer-p</code></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="rn03re64.html">Prev</a> </td><th width="60%" align="center">Objects</th><td width="20%" align="right"> <a accesskey="n" href="rn03re66.html">Next</a></td></tr></table><hr></div><div class="refentry" title="null-pointer-p"><a name="uffi.null-pointer-p"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p><code class="function">null-pointer-p</code> — Tests a pointer for <code class="constant">NULL</code> value.
</p></div><div class="refsynopsisdiv" title="Macro"><h2>Macro</h2><div class="funcsynopsis"><p><code class="funcdef">(null-pointer-p</code> <var class="pdparam">ptr</var>)</p></div><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><p><span class="term"><em class="parameter"><code>ptr</code></em></span></p></td><td><p>A foreign object pointer.</p></td></tr><tr><td><p><span class="term">returns</span></p></td><td><p>The boolean flag.</p></td></tr></tbody></table></div></div><div class="refsect1" title="Description"><a name="id690830"></a><h2>Description</h2><p>
A predicate testing if a pointer is has a <code class="constant">NULL</code> value.</p></div><div class="refsect1" title="Side Effects"><a name="id690845"></a><h2>Side Effects</h2><p>None.</p></div><div class="refsect1" title="Affected by"><a name="id690855"></a><h2>Affected by</h2><p>None.</p></div><div class="refsect1" title="Exceptional Situations"><a name="id690865"></a><h2>Exceptional Situations</h2><p>None.</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="rn03re64.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="rn03.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="rn03re66.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><code class="function">make-null-pointer</code> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> <code class="varname">+null-cstring-pointer+</code></td></tr></table></div></body></html>
