built-in predicate

conforms_to_protocol/2-3

Description

conforms_to_protocol(Object, Protocol)
conforms_to_protocol(Category, Protocol)

conforms_to_protocol(Object, Protocol, Scope)
conforms_to_protocol(Category, Protocol, Scope)

Enumerates, by backtracking, all pairs of entities such that an object or a category conforms to a protocol. The relation scope is represented by the atoms public, protected, and private. This predicate implements a transitive closure for the protocol implementation relation.

Modes and number of proofs

conforms_to_protocol(?object_identifier, ?protocol_identifier) - zero_or_more
conforms_to_protocol(?category_identifier, ?protocol_identifier) - zero_or_more

conforms_to_protocol(?object_identifier, ?protocol_identifier, ?scope) - zero_or_more
conforms_to_protocol(?category_identifier, ?protocol_identifier, ?scope) - zero_or_more

Errors

Object is neither a variable nor a valid object identifier:

type_error(object_identifier, Object)

Category is neither a variable nor a valid category identifier:

type_error(category_identifier, Category)

Protocol is neither a variable nor a valid protocol identifier:

type_error(protocol_identifier, Protocol)

Scope is neither a variable nor an atom:

type_error(atom, Scope)

Scope is an atom but an invalid entity scope:

domain_error(scope, Scope)

Examples

% enumerate objects and categories that conform to the listp protocol:
| ?- conforms_to_protocol(Object, listp).

% enumerate objects and categories that privately conform to the listp protocol:
| ?- conforms_to_protocol(Object, listp, private).

% enumerate only objects that conform to the listp protocol:
| ?- current_object(Object), conforms_to_protocol(Object, listp).

% enumerate only categories that conform to the serialization protocol:
| ?- current_category(Category), conforms_to_protocol(Category, serialization).

See also

current_object/1, current_protocol/1, current_category/1, implements_protocol/2-3