create_category(Identifier, Relations, Directives, Clauses)
Creates a new, dynamic category. This predicate is often used as a primitive to implement high-level category creation methods.
Note that, when opting for runtime generated category identifiers, it's possible to run out of identifiers when using a back-end Prolog compiler with bounded integer support. The portable solution, when creating a large number of dynamic category in long running applications, is to recycle, whenever possible, the identifiers.
When using Logtalk multi-threading features, predicates calling this built-in predicate may need to be declared synchronized in order to avoid race conditions.
create_category(?category_identifier, @list(category_relation), @list(category_directive), @list(clause))
instantiation_error
type_error(category_identifier, Identifier)
permission_error(modify, category, Identifier)
permission_error(modify, object, Identifier)
permission_error(modify, protocol, Identifier)
type_error(list, Relations)
permission_error(repeat, entity_relation, implements/1)
permission_error(repeat, entity_relation, extends/1)
permission_error(repeat, entity_relation, complements/1)
type_error(list, Directives)
type_error(list, Clauses)
| ?- create_category( tolerances, [implements(comparing)], [], [epsilon(1e-15), (equal(X, Y) :- epsilon(E), abs(X-Y) =< E)] ).
abolish_category/1
, category_property/2
, current_category/1
complements_object/2
, extends_category/2-3
, imports_category/2-3