built-in method
retractall/1
Description
retractall(Head)
Retracts all clauses with a matching head for an object dynamic predicate.
When the predicate indicator for Head is declared in a
uses/2 or use_module/2 directive,
the clauses are retracted in the referenced object or module. When the
backend Prolog compiler supports a module system, the predicate argument
can also be module qualified.
This method may be used to retract clauses for predicates that are not declared dynamic for dynamic objects provided that the predicates are declared in this.
Modes and number of proofs
retractall(@callable) - one
Errors
Head is a variable:instantiation_errorHead is neither a variable nor a callable term:type_error(callable, Head)The predicate indicator of
Head, Name/Arity, is that of a private predicate:permission_error(modify, private_predicate, Name/Arity)The predicate indicator of
Head, Name/Arity, is that of a protected predicate:permission_error(modify, protected_predicate, Name/Arity)The predicate indicator of
Head, Name/Arity, is that of a static predicate:permission_error(modify, static_predicate, Name/Arity)The predicate indicator of
Head, Name/Arity, is not declared:existence_error(predicate_declaration, Name/Arity)Examples
To retract all clauses with a matching head of a dynamic predicate in this:
retractall(Head)To retract all clauses with a matching head of a public or protected dynamic predicate in self:
::retractall(Head)To retract all clauses with a matching head of a public dynamic predicate in an explicit object:
Object::retractall(Head)