<?xml version="1.0" encoding="iso-8859-1"?> <?xml-stylesheet type="text/css" href="../../styles.css" ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"> <head> <meta http-equiv="content-type" content="text/html; charset=iso-8859-1" /> <title>Logtalk built-in predicate: forall/2</title> <link rel="stylesheet" href="../../styles.css" type="text/css" /> </head> <body> <div class="navtop"> <a href="../../index.html">contents</a> > <a href="../index.html">reference manual</a> > <a href="../index.html#builtins">built-in predicates</a> </div> <h2><code>forall/2</code></h2> <h4>Description</h4> <blockquote> <pre>forall(Generator, Test)</pre> <p> This predicate is true if, for all solutions of Generator, Test is true (some Prolog compilers already define this or a similar predicate). </p> </blockquote> <h4>Template and modes</h4> <blockquote> <pre>forall(+callable, +callable)</pre> </blockquote> <h4>Errors</h4> <blockquote> <dl> <dt>Generator is not a callable term:</dt> <dd><code>type_error(callable, Generator)</code></dd> <dt>Test is not a callable term:</dt> <dd><code>type_error(callable, Test)</code></dd> </dl> </blockquote> <h4>Examples</h4> <blockquote> <pre>| ?- forall(member(X, [1, 2, 3]), write(X)). 123 yes</pre> </blockquote> <div class="navbottom"> <a href="../index.html#builtins">previous</a> | <a href="../../glossary.html">glossary</a> | <a href="retractall1.html">next</a> </div> <div class="copyright"> Copyright © <a href="mailto:pmoura@logtalk.org">Paulo Moura</a> — <a href="http://www.logtalk.org">Logtalk.org</a> </div> <div class="footer"> <p><span class="bleft"><a href="http://validator.w3.org/check/referer">XHTML</a> + <a href="http://jigsaw.w3.org/css-validator/check/referer">CSS</a></span><span class="bright">Last updated on: July 22, 2004</span></p> </div> </body> </html>