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<html><head><title>XLISP fboundp</title>
<link rel="stylesheet" type="text/css" href="reference.css">
</head>
<body>
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<hr>
<h1>fboundp</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>predicate function (subr)</nobr></td>
</tr>
<tr valign="top">
<td><nobr>Source:</nobr></td>
<td><nobr> - </nobr></td>
<td width="100%"><nobr>xlbfun.c</nobr></td>
</tr>
</tbody></table></p>
<h2>Syntax</h2>
<dl>
<dt>(fboundp <i>symbol</i>)</dt>
<dd><i>symbol</i> - the symbol expression to check for a value<br>
returns - <a href="t.htm"> T </a> if a functional
value is bound to the symbol, <a href="nil.htm">NIL</a>
otherwise</dd>
</dl>
<h2>Description</h2>
<p>The 'fboundp' predicate function checks to see if 'symbol' is a symbol
with a function definition bound to it.
<a href="t.htm"> T </a> is returned if 'symbol' has a
function value, <a href="nil.htm">NIL</a> is returned otherwise.
Note that 'symbol' is a symbol expression, it is evaluated and the resulting
expression is the one that is checked.</p>
<h2>Examples</h2>
<pre class="example">
(defun foo (x) (print x)) <font color="#008844">; set up function FOO</font>
(fboundp 'foo) <font color="#008844">; returns T - FOO is closure</font>
(fboundp 'car) <font color="#008844">; returns T - CAR is subr</font>
(setq myvar 'goo) <font color="#008844">; set up MYVAR to have value GOO</font>
(fboundp myvar) <font color="#008844">; returns NIL - because GOO has no value yet</font>
(defmacro goo () (print "hi")) <font color="#008844">; define GOO macro</font>
(fboundp myvar) <font color="#008844">; returns T</font>
(fboundp 'a) <font color="#008844">; returns NIL</font>
(fboundp '1) <font color="#008844">; error: bad argument type - 1</font>
(fboundp "hi") <font color="#008844">; error: bad argument type - "hi"</font>
</pre>
<p>See the
<a href="../manual/xlisp-man-018.htm#fboundp">fboundp</a>
predicate function in the <nobr>XLISP 2.0</nobr> manual.</p>
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