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< title > Logtalk built-in method: clause/2< / title >
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< div class = "top-left" > Logtalk reference manual< / div >
< div class = "top-right" > Built-in method: clause/2< / 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 class = "code" > clause/2< / h2 >
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< h4 > Description< / h4 >
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< pre > clause(Head, Body)< / pre >
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< p >
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Enumerates, by backtracking, the clauses of an object's dynamic predicates.
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< / p >
< h4 > Template and modes< / h4 >
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< pre > clause(+callable, ?body)< / pre >
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< h4 > Errors< / h4 >
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< dl class = "errors" >
< dt > Head is a variable:< / dt >
< dd > < code > instantiation_error< / code > < / dd >
< dt > Head is a neither a variable nor a callable term:< / dt >
< dd > < code > type_error(callable, Head)< / code > < / dd >
< dt > Body is a neither a variable nor a callable term:< / dt >
< dd > < code > type_error(callable, Body)< / code > < / dd >
< dt > The predicate indicator of Head is that of a private predicate:< / dt >
< dd > < code > permission_error(access, private_predicate, Head)< / code > < / dd >
< dt > The predicate indicator of Head is that of a protected predicate:< / dt >
< dd > < code > permission_error(access, protected_predicate, Head)< / code > < / dd >
< dt > The predicate indicator of Head is that of a static predicate:< / dt >
< dd > < code > permission_error(access, static_predicate, Head)< / code > < / dd >
< dt > Head is not a declared predicate:< / dt >
< dd > < code > existence_error(predicate_declaration, Head)< / code > < / dd >
< / dl >
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< h4 > Examples< / h4 >
< blockquote >
< dl >
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< dt > To retrieve 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 > clause(Head, Body)< / code > < / dd >
< dt > To retrieve 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 > ::clause(Head, Body)< / code > < / dd >
< dt > To retrieve a matching clause of a public dynamic predicate in an object:< / dt >
< dd > < code > Object::clause(Head, Body)< / code > < / dd >
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< / blockquote >
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< div class = "navbottom" > < a href = "assertz1.html" > previous< / a > | < a href = "../../glossary.html" > glossary< / a > | < a href = "retract1.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 >
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< span class = "date" > Last updated on: November 16, 2005< / span >
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