clause/2

Description

clause(Head, Body)

Enumerates, by backtracking, the clauses of an object's dynamic predicates.

Template and modes

clause(+callable, ?body)

Errors

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)

Examples

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)