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<html><head><title>XLISP streamp</title>
<link rel="stylesheet" type="text/css" href="reference.css">
</head>
<body>
<a href="../start.htm">Nyquist / XLISP 2.0</a> -
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<hr>
<h1>streamp</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>(streamp <i>expr</i>)</dt>
<dd><i>expr</i> - the expression to check<br>
returns - <a href="t.htm"> T </a> if the value is a
stream, <a href="nil.htm">NIL</a> otherwise</dd>
</dl>
<h2>Description</h2>
<p>The 'streamp' predicate function checks if an 'expr' is a stream.
<a href="t.htm"> T </a> is returned if 'expr' is a
stream, <a href="nil.htm">NIL</a> is returned otherwise.</p>
<p>EXAMPLES</p>
<pre class="example">
(streamp *standard-input*) <font color="#008844">; returns T - stream</font>
(streamp *debug-io*) <font color="#008844">; returns T - stream</font>
(streamp (make-string-output-stream)) <font color="#008844">; returns T - stream</font>
(setq a *standard-output*)
(streamp a) <font color="#008844">; returns T - evaluates to stream</font>
(streamp "a") <font color="#008844">; returns NIL - string</font>
(streamp #\a) <font color="#008844">; returns NIL - character</font>
(streamp '(a b c)) <font color="#008844">; returns NIL - list</font>
(streamp 1) <font color="#008844">; returns NIL - integer</font>
(streamp 1.2) <font color="#008844">; returns NIL - float</font>
(streamp '*debug-io*) <font color="#008844">; returns NIL - symbol</font>
(streamp 'a) <font color="#008844">; returns NIL - symbol</font>
(streamp #(0 1 2)) <font color="#008844">; returns NIL - array</font>
(streamp NIL) <font color="#008844">; returns NIL - NIL</font>
</pre>
<p>See the
<a href="../manual/xlisp-man-018.htm#streamp">streamp</a>
predicate function in the <nobr>XLISP 2.0</nobr> manual.</p>
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