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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">

<html>
<head>
<title>SWI-Prolog 7.1.10 Reference Manual: Section B.2</title><link rel="home" href="index.html">
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<h2 id="sec:ancestral-cut"><a id="sec:B.2"><span class="sec-nr">B.2</span> <span class="sec-title">Ancestral 
cuts</span></a></h2>

<a id="sec:ancestral-cut"></a>

<dl class="latex">
<dt class="pubdef"><a id="prolog_cut_to/1"><strong>prolog_cut_to</strong>(<var>+Choice</var>)</a></dt>
<dd class="defbody">
Prunes all choice points created since <var>Choice</var>. Can be used 
together with <a id="idx:prologcurrentchoice1:1848"></a><a class="pred" href="manipstack.html#prolog_current_choice/1">prolog_current_choice/1</a> 
to implement <em>ancestral</em> cuts. This predicate is in the hackers 
corner because it should not be used in normal Prolog code. It may be 
used to create new high level control structures, particularly for 
compatibility purposes.
</dd>
</dl>

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