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< title > Logtalk built-in method: retract/1< / title >
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< div class = "top-left" > Logtalk reference manual< / div >
< div class = "top-right" > Built-in method: retract/1< / 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#methods" > built-in methods< / a > < / div >
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< h2 id = "methods_retract1" class = "codenp" > retract/1< / h2 >
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< h4 > Description< / h4 >
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< pre > retract(Clause)
retract((Head:-Body))< / pre >
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< p >
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Retracts a dynamic clause from an object.
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< / p >
< h4 > Template and modes< / h4 >
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< pre > retract(+clause)< / pre >
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< h4 > Errors< / h4 >
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< dl >
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< 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 >
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< h4 > Examples< / h4 >
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< dl >
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< 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 >
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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 / >
< span > Last updated on: October 26, 2006< / span >
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