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< title > clause/2< / title >
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< h2 > < code > < a class = "back" title = "Return to index" href = "../index.html#clause2" > clause/2< / a > < / code > < / h2 >
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< h4 > Description< / h4 >
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clause(Head, Body)
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Enumerates, by backtracking, the clauses of an object's dynamic predicates.
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< h4 > Template and modes< / h4 >
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clause(+callable, ?body)
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< h4 > Errors< / h4 >
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< 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 >
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< h4 > Examples< / h4 >
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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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< strong > < a href = "assertz1.html" > Previous< / a > | < a href = "retract1.html" > Next< / a > | < a href = "../index.html" > Table of Contents< / a > | < a href = "../../bibliography.html" > Bibliography< / a > | < a href = "../../glossary.html" > Glossary< / a > < / strong >
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Last updated on: July 29, 2002
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