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Initial revision
Annotate for file docs/html/subseq-template-class.html
2004-11-17 mantoniotti
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<html>
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<head>
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<title>CL Unification: Class SUBSEQ-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 SUBSEQ-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>SUBSEQ-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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SUBSEQ-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 SUBSEQ-TEMPLATE class denotes those object that are used
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to unify against a particular element of an ARRAY.</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>subseq</b> <i>start</i> <i>end</i> . <i><destructuring template lambda list></i>)
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</pre>
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</p>
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<p>The SUBSEQ-TEMPLATE syntax is used to unify the elements of a
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SEQUENCE starting from <i>start</i> and below <i>end</i>, against
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the <i><destructuring template lambda list></i>.</p>
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<p><i>start</i> and <i>end</i> must be supplied and must be valid
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sequence indexes, i.e. most likely, FIXNUMs; however, <i>end</i> can
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also be NIL, in which case the usual SUBSEQ semantics applies.</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>subseq</b> 2 4 ?x ?y)))
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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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T
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cl-prompt> (find-variable-value '?y e)
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3
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T
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cl-prompt> (setq e (unify #(0 1 42 3 4 5) #T(<b>subseq</b> 0 4 42 ?x)))
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--> Error: UNIFICATION-FAILURE
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cl-prompt> (setq e (unify "This is a string!" #T(<b>subseq</b> 4 nil &rest ?str)))
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#<ENVIRONMENT xxx>
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cl-prompt> (find-variable-value '?str e)
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" is a string!"
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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 SUBSEQ-TEMPLATE against a non-SEQUENCE 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>
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<!-- <td height="100%"> </td> -->
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</tr>
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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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</td>
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<td height="100%"> </td>
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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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