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<meta http-equiv="content-type" content="application/xml+xhtml; charset=utf-8" />
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2003-12-30 13:33:51 +00:00
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<title>Logtalk control construct: {}/1</title>
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<body>
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2005-12-24 18:00:21 +00:00
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<div class="top-left">Logtalk reference manual</div>
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<div class="top-right">Control construct: {}/1</div>
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<div class="bottom-left"><span class="page"/></div>
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<div class="bottom-right"><span class="page"/></div>
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<div class="navtop"><a href="../../index.html">contents</a> > <a href="../index.html">reference manual</a> > <a href="../index.html#constructs">control constructs</a></div>
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2003-12-30 13:33:51 +00:00
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2007-06-12 10:39:47 +00:00
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<h2 id="control_external1" class="codenp">{}/1</h2>
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<h4>Description</h4>
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<pre>{Goal}</pre>
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<p>
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Calls external Prolog code. Can be used to bypass the Logtalk compiler. The argument is called within the context of the pseudo-object <em>user</em>.
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</p>
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<h4>Template and modes</h4>
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<pre>{+callable}</pre>
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2001-12-05 23:57:48 +00:00
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<h4>Errors</h4>
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<dl>
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<dt>Goal is a variable:</dt>
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<dd><code>instantiation_error</code></dd>
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<dt>Goal is neither a variable nor a callable term:</dt>
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<dd><code>type_error(callable, Goal)</code></dd>
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</dl>
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<h4>Examples</h4>
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2003-12-30 13:33:51 +00:00
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<pre>N1/D1 < N2/D2 :-
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{N1*D2 < N2*D1}.</pre>
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2003-12-30 13:33:51 +00:00
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<div class="footer">
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2006-11-07 17:11:47 +00:00
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<div class="copyright">
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<span>Copyright © <a href="mailto:pmoura@logtalk.org">Paulo Moura</a> — <a href="http://logtalk.org">Logtalk.org</a></span><br/>
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2007-06-12 10:39:47 +00:00
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<span>Last updated on: June 5, 2007</span>
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2006-11-07 17:11:47 +00:00
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2005-12-24 18:00:21 +00:00
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2003-12-30 13:33:51 +00:00
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