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git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@791 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
81 lines
2.2 KiB
HTML
81 lines
2.2 KiB
HTML
<?xml version="1.0" encoding="iso-8859-1"?>
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<?xml-stylesheet type="text/css" href="../../styles.css" ?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
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<head>
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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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<body>
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<hr />
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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. Note that this predicate implies an instantiation between its second argument and the corresponding implicit context argument in the predicate containing the call. This instantiation occurs at the clause head, not at the clause body. 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:</dt>
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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: March 4, 2003
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</p>
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<hr />
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</body>
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</html>
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