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<html><head><title>XLISP *applyhook*</title>
<link rel="stylesheet" type="text/css" href="reference.css">
</head>
<body>
<a href="../start.htm">Nyquist / XLISP 2.0</a> -
<a href="../manual/contents.htm">Contents</a> |
<a href="../tutorials/tutorials.htm">Tutorials</a> |
<a href="../examples/examples.htm">Examples</a> |
<a href="reference-index.htm">Reference</a>
<hr>
<h1>*applyhook*</h1>
<hr>
<p><table cellpadding="0" cellspacing="0" style="margin-left:10px"><tbody>
<tr valign="top">
<td><nobr>Type:</nobr></td>
<td><nobr> - </nobr></td>
<td width="100%"><nobr>system variable</nobr></td>
</tr>
<tr valign="top">
<td><nobr>Source:</nobr></td>
<td><nobr> - </nobr></td>
<td width="100%"><nobr>xlglob.c (not implemented)</nobr></td>
</tr>
</tbody></table></p>
<h2>Syntax</h2>
<p><div class="box">
<dl>
<dt> *applyhook*</dt>
</dl>
</div></p>
<h2>Description</h2>
<p> *applyhook* is a system variable that exists and is initialized to
<a href="nil.htm">NIL</a>. It is a hook that is intended to
contain a user function that is to be called whenever a function is applied
to a list of arguments. It is not, however, implemented in XLISP 2.0, it
only exists as a dummy hook.</p>
<h2>Examples</h2>
<pre class="example">
*applyhook* => NIL
</pre>
<p>*applyhook* is often used to implement function stepping functionality in
a debugger.</p>
<p>See also:</p>
<ul>
<li><nobr><a href="../manual/contents.htm#symbols">Symbols</a></nobr></li>
<li><nobr><a href="../manual/contents.htm#evaluation-functions">Evaluation Functions</a></nobr></li>
</ul>
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