clause/2clause(Head, Body)Enumerates, by backtracking, the clauses of an object's dynamic predicates. Note however that if the clauses for the dynamic predicate are contained in a category the predicate will fail.
clause(?callable, ?body)
- Head is a variable:
instantiation_error- Head is a neither a variable nor a callable term:
type_error(callable, Head)- Body is a neither a variable nor a callable term:
type_error(callable, Body)- The predicate indicator of Head is that of a private predicate:
permission_error(access, private_predicate, Head)- The predicate indicator of Head is that of a protected predicate:
permission_error(access, protected_predicate, Head)- The predicate indicator of Head is that of a static predicate:
permission_error(access, static_predicate, Head)- Head is not a declared predicate:
existence_error(predicate_declaration, Head)
- To retrieve a matching clause of any dynamic predicate in this:
clause(Head, Body)- To retrieve a matching clause of a public or protected dynamic predicate in self:
::clause(Head, Body)- To retrieve a matching clause of a public dynamic predicate in an object:
Object::clause(Head, Body)
Previous | Next | Table of Contents | Bibliography | Glossary
Last updated on: October 21, 2001