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78 lines
1.8 KiB
HTML
78 lines
1.8 KiB
HTML
<!doctype html public "-//W3C//DTD HTML 4.01//EN"
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<title>parameter/2</title>
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<link rel=stylesheet href="../../styles.css" type="text/css">
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</head>
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<h2><code><a class="back" title="Return to index" href="../index.html#parameter2">parameter/2</a></code></h2>
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<hr />
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<h4>Description</h4>
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<blockquote>
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<pre>
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parameter(Number, Term)
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</pre>
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<p>
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Used only in <a class="glossary" title="Go to glossary definition" href="../../glossary.html#parametric">parametric objects</a>, this method returns parameter values by using the parameter position in the entity identifier. See also <a href="this1.html"><code>this/1</code></a>.
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</p>
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</blockquote>
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<h4>Template and modes</h4>
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<blockquote>
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<pre>
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parameter(+integer, ?term)
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</pre>
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</blockquote>
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<h4>Errors</h4>
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<blockquote>
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<dl>
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<dt>Number is a variable:</dt>
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<dd><code>instantiation_error</code></dd>
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<dt>Number is neither a variable nor an integer value:
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<dd><code>type_error(integer, Number)</code></dd>
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<dt>Object identifier is not a compound term:</dt>
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<dd><code>type_error(compound, Object)</code></dd>
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<dt>Number is a negative integer value:</dt>
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<dd><code>domain_error(not_less_than_zero, Number)</code></dd>
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</dl>
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</blockquote>
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<h4>Examples</h4>
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<blockquote>
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<pre>
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:- object(box(_Colour)).
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...
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colour(Colour) :-
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parameter(1, Colour).
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...
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</pre>
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</blockquote>
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<hr />
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<p class="center">
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<strong><a href="../builtins/retractall1.html">Previous</a> | <a href="self1.html">Next</a> | <a href="../index.html">Table of Contents</a> | <a href="../../bibliography.html">Bibliography</a> | <a href="../../glossary.html">Glossary</a></strong>
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</p>
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<p class="center">
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Last updated on: February 9, 2002
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</body>
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</html>
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