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Initial revision
Annotate for file /docs/html/find-variable-value-function.html
2004-11-17 mantoniotti
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<title>CL Unification: Function FIND-VARIABLE-VALUE</title>
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<strong><i>CL Unification: Function FIND-VARIABLE-VALUE</title></i></strong>
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<h1><i>Function</i> <strong>FIND-VARIABLE-VALUE</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>Syntax:</h2>
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<p>
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<pre>
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<b>find-variable-value</b> <i>variable-name</i> &optional <i>env</i> <i>errorp</i>
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=> <i>value</i>, <i>found</i>
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</pre>
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</p>
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<h3>Arguments and Values:</h3>
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<p><i><code>variable-name</code></i>---a <i>symbol</i> denoting a <em>unification variable</em></p>
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<p><i><code>env</code></i>---an <i>unification-environment</i></p>
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<p><i><code>value</code></i>---an <i>object</i></p>
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<p><i><code>found</code></i>---a <i>boolean</i></p>
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<h2>Description:</h2>
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<p>The function FIND-VARIABLE-VALUE searches the environment
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<i>env</i> for the <i>value</i> associated to the unification variable
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<i>variable-name</i>.<p>
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<p>If there is a <i>value</i> associated to <i>variable-name</i> in
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<i>env</i>, then it is returned; <i>found</i>, the second return
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value, is T.
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<p>If no value is associated to <i>variable-name</i> then
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FIND-VARIABLE-NAME signals an error of type
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UNIFICATION-VARIABLE-UNBOUND if <i>errorp</i> is non-NIL (the
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default.) If <i>errorp</i> is NIL then FIND-VARIABLE-NAME returns
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the values NIL and NIL.</p>
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<p><i>env</i> defaults to *NULL-ENVIRONMENT*.
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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>None.</p>
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<h2>See Also:</h2>
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<p>UNIFY:ENVIRONMENT, BINDING, UNIFICATION-VARIABLE-UNBOUND, *NULL-ENVIRONMENT*</p>
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<h2>Notes:</h2>
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<p>None.</p>
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</td>
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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>2004-10-09</strong><br>
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Completed description.
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</li>
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</ul>
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<div class="copyright">
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© 2003-2004, Marco Antoniotti, all rights reserved.
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