<HTML> <HEAD> <!-- Created by texi2html 1.56k + clip patches and <A href="http://www.clip.dia.fi.upm.es/Software">lpdoc</A> from ciao.texi on 28 January 2007 --> <LINK rel="stylesheet" href="ciao.css" type="text/css"> <TITLE>The Ciao Prolog System - Delaying predicates (freeze)</TITLE> </HEAD> <BODY> Go to the <A HREF="ciao_1.html">first</A>, <A HREF="ciao_105.html">previous</A>, <A HREF="ciao_107.html">next</A>, <A HREF="ciao_241.html">last</A> section, <A HREF="ciao_toc.html">table of contents</A>. <P><HR><P> <H1><A NAME="SEC439" HREF="ciao_toc.html#TOC439">Delaying predicates (freeze)</A></H1> <P> <A NAME="IDX5400"></A> <P> <STRONG>Author(s):</STRONG> Manuel Carro, Daniel Cabeza. <P> <STRONG>Version:</STRONG> 1.10#7 (2006/4/26, 19:22:13 CEST) <P> <STRONG>Version of last change:</STRONG> 1.5#72 (2000/3/19, 19:9:14 CET) <P> This library offers a simple implementation of <A NAME="IDX5401"></A> <CODE>freeze/2</CODE>, <A NAME="IDX5402"></A> <CODE>frozen/2</CODE>, etc. [Col82,Nai85,Nai91,Car87] based on the use of attributed variables [Hol92,Hol90]. <UL> <LI><A HREF="ciao_106.html#SEC440">Usage and interface (freeze)</A> <LI><A HREF="ciao_106.html#SEC441">Documentation on exports (freeze)</A> </UL> <H2><A NAME="SEC440" HREF="ciao_toc.html#TOC440">Usage and interface (<CODE>freeze</CODE>)</A></H2> <div class="cartouche"> <UL> <LI><STRONG>Library usage:</STRONG> <CODE>:- use_module(library(freeze)).</CODE> <LI><STRONG>Exports:</STRONG> <UL> <LI><EM>Predicates:</EM> <A NAME="IDX5403"></A> <CODE>freeze/2</CODE>, <A NAME="IDX5404"></A> <CODE>frozen/2</CODE>. </UL> </UL> </div class="cartouche"> <H2><A NAME="SEC441" HREF="ciao_toc.html#TOC441">Documentation on exports (<CODE>freeze</CODE>)</A></H2> <P> <A NAME="IDX5405"></A> <A NAME="IDX5406"></A> <DL> <DT><span class="define">PREDICATE:</span> <B>freeze/2:</B> <DD><A NAME="IDX5407"></A> <P> <EM>Meta-predicate</EM> with arguments: <CODE>freeze(?,goal)</CODE>. <P> <STRONG>Usage:</STRONG> <CODE>freeze(X, Goal)</CODE> <UL> <LI><EM>Description:</EM> If <CODE>X</CODE> is free delay <CODE>Goal</CODE> until <CODE>X</CODE> is non-variable. <LI><EM>The following properties should hold at call time:</EM> <CODE>Goal</CODE> is a term which represents a goal, i.e., an atom or a structure. (<CODE>basic_props:callable/1</CODE>) </UL> </DL> <P> <A NAME="IDX5408"></A> <A NAME="IDX5409"></A> <DL> <DT><span class="define">PREDICATE:</span> <B>frozen/2:</B> <DD><A NAME="IDX5410"></A> <P> <EM>Meta-predicate</EM> with arguments: <CODE>frozen(?,goal)</CODE>. <P> <STRONG>Usage:</STRONG> <CODE>frozen(X, Goal)</CODE> <UL> <LI><EM>Description:</EM> <CODE>Goal</CODE> is currently delayed until variable <CODE>X</CODE> becomes bound. <LI><EM>The following properties should hold upon exit:</EM> <CODE>Goal</CODE> is a term which represents a goal, i.e., an atom or a structure. (<CODE>basic_props:callable/1</CODE>) </UL> </DL> <P><HR><P> Go to the <A HREF="ciao_1.html">first</A>, <A HREF="ciao_105.html">previous</A>, <A HREF="ciao_107.html">next</A>, <A HREF="ciao_241.html">last</A> section, <A HREF="ciao_toc.html">table of contents</A>. </BODY> </HTML>
