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Initial revision
Annotate for file /docs/html/nth-template-class.html
2004-11-17 mantoniotti
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<head>
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<title>CL Unification: Class NTH-TEMPLATE</title>
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<div class="header"
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style="font-family:=Verdana,Arial,Helvetica; font-size: 18px; color: #41286f;">
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<strong><i>CL Unification: Class NTH-TEMPLATE</title></i></strong>
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<div class="content">
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<div class="text" style="padding-top: 10px;">
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<h1><i>Class</i> <strong>NTH-TEMPLATE</strong></h1>
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<h2>Package:</h2>
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<p><code>COMMON-LISP.EXTENSIONS.DATA-AND-CONTROL-FLOW.UNIFICATION</code></p>
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<h2>Class Precedence List:</h2>
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<p>
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NTH-TEMPLATE, ELEMENT-TEMPLATE, EXPRESSION-TEMPLATE, TEMPLATE, STANDARD-OBJECT, T.
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</p>
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<h2>Known Subclasses:</h2>
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<p>
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None.
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</p>
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<h2>Slots:</h2>
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<p>None.</p>
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<h2>Description:</h2>
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<p>The NTH-TEMPLATE class denotes those object that are used
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to unify against a particular element of a LIST.</p>
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<h3>Template Syntax:</h3>
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<p>
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<pre>
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#T(<b>nth</b> <i>index</i> <i>item</i>)
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</pre>
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</p>
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<p>The NTH-TEMPLATE syntax denotes the <i>item</i> at <i>index</i>
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a LIST. A NTH-TEMPLATE must
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be unified against a LIST object. <i>item</i> is <em>unified</em>
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against the element extracted from the sequence object at
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<i>index</i> by the standard function NTH.</p>
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<h2>Examples:</h2>
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<p>
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<pre>
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cl-prompt> (setf e (unify '(0 1 42 3 4 5) #T(<b>nth</b> 2 ?x)))
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#<ENVIRONMENT xxx>
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cl-prompt> (find-variable-value '?x e)
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42
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cl-prompt> (setq e (unify '(0 1 42 3 4 5) #T(<b>nth</b> 42 ?x)))
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--> Error: index 42 out of bounds. <STRONG>FIX THIS</STRONG>
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cl-prompt> (setq e (unify #(a s d) #T(<b>nth</b> 1 ?x)))
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--> Error: UNIFICATION-FAILURE
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</pre>
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</p>
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<h2>Affected By:</h2>
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<p>None.</p>
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<h2>Exceptional Situations:</h2>
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<p>Unifying an NTH-TEMPLATE against a non-LIST object results in
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an UNIFICATION-FAILURE error being signaled.</p>
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<h2>See Also:</h2>
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<p>UNIFY</p>
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<h2>Notes:</h2>
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<p>None.</p>
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<td height="100%"> </td>
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<td valign="top" width="80%" height="100%">
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<div class="content">
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<div class="text" style="padding-top: 10px;">
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<h1>News</h1>
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<p>News in chronological order, most recent on top.
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</p>
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<ul>
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<li><strong>2004-06-11</strong><br>
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Completed description.
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</li>
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</ul>
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</div>
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</div>
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</tr>
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<tr>
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<td colspan="3" valign="bottom" align="right">
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<div class="copyright">
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© 2003-2004, Marco Antoniotti, all rights reserved.
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</div>
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</table>
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</body>
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</html>
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