2002-08-01 00:34:42 +01:00
<?xml version="1.0" encoding="iso-8859-1"?>
<?xml-stylesheet type="text/css" href="../../styles.css" ?>
2001-06-06 21:07:01 +01:00
2003-12-30 13:33:51 +00:00
< !DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
2002-08-01 00:34:42 +01:00
< html xmlns = "http://www.w3.org/1999/xhtml" lang = "en" xml:lang = "en" >
2001-06-06 21:07:01 +01:00
< head >
2003-12-30 13:33:51 +00:00
< meta http-equiv = "content-type" content = "text/html; charset=iso-8859-1" / >
< title > Logtalk built-in method: retract/1< / title >
2002-08-26 17:45:50 +01:00
< link rel = "stylesheet" href = "../../styles.css" type = "text/css" / >
2001-06-06 21:07:01 +01:00
< / head >
< body >
2003-12-30 13:33:51 +00:00
< div class = "navtop" >
< a href = "../../index.html" > contents< / a > > < a href = "../index.html" > reference manual< / a > > < a href = "../index.html#methods" > built-in methods< / a >
< / div >
< h2 > < code > retract/1< / code > < / h2 >
2001-06-06 21:07:01 +01:00
< h4 > Description< / h4 >
< blockquote >
2003-12-30 13:33:51 +00:00
< pre > retract(Clause)
retract((Head:-Body))< / pre >
2001-06-06 21:07:01 +01:00
< p >
2002-04-03 14:26:59 +01:00
Retracts a dynamic clause from an object.
2001-06-06 21:07:01 +01:00
< / p >
< / blockquote >
< h4 > Template and modes< / h4 >
< blockquote >
2003-12-30 13:33:51 +00:00
< pre > retract(+clause)< / pre >
2001-06-06 21:07:01 +01:00
< / blockquote >
2001-12-05 23:57:48 +00:00
< h4 > Errors< / h4 >
2001-06-06 21:07:01 +01:00
< blockquote >
< dl >
< dt > Head is a variable:< / dt >
< dd > < code > instantiation_error< / code > < / dd >
< dt > Head is neither a variable nor a callable term:< / dt >
< dd > < code > type_error(callable, Head)< / code > < / dd >
< dt > The predicate indicator of Head is that of a private predicate:< / dt >
< dd > < code > permission_error(modify, private_predicate, Head)< / code > < / dd >
< dt > The predicate indicator of Head is that of a protected predicate:< / dt >
< dd > < code > permission_error(modify, protected_predicate, Head)< / code > < / dd >
< dt > The predicate indicator of Head is that of a static predicate:< / dt >
< dd > < code > permission_error(modify, static_predicate, Head)< / code > < / dd >
< dt > The predicate indicator of Head is not declared:< / dt >
< dd > < code > existence_error(predicate_declaration, Head)< / code > < / dd >
< / dl >
< / blockquote >
< h4 > Examples< / h4 >
< blockquote >
< dl >
< dt > To retract a matching clause of any dynamic predicate in < a class = "glossary" title = "Go to glossary definition" href = "../../glossary.html#this" > this< / a > :< / dt >
< dd > < code > retract(Clause)< / code > < / dd >
< dt > To retract a matching clause of a public or protected dynamic predicate in < a class = "glossary" title = "Go to glossary definition" href = "../../glossary.html#self" > self< / a > :< / dt >
< dd > < code > ::retract(Clause)< / code > < / dd >
< dt > To retract a matching clause of a public dynamic predicate in an object:< / dt >
< dd > < code > Object::retract(Clause)< / code > < / dd >
< / dl >
< / blockquote >
2003-12-30 13:33:51 +00:00
< div class = "navbottom" >
< a href = "clause2.html" > previous< / a > | < a href = "../../glossary.html" > glossary< / a > | < a href = "retractall1.html" > next< / a >
< / div >
2001-06-06 21:07:01 +01:00
2003-12-30 13:33:51 +00:00
< div class = "copyright" >
Copyright © < a href = "mailto:pmoura@logtalk.org" > Paulo Moura< / a > — < a href = "http://www.logtalk.org" > Logtalk.org< / a >
< / div >
2001-06-06 21:07:01 +01:00
2003-12-30 13:33:51 +00:00
< 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: December 23, 2003< / span > < / p >
< / div >
< / body >
2001-06-06 21:07:01 +01:00
< / html >
