Logtalk reference manual
Built-in predicate: conforms_to_protocol/2-3

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.

Template and modes

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

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

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 not a valid entity scope:
domain_error(scope, Scope)

Examples

| ?- conforms_to_protocol(list, listp).

| ?- conforms_to_protocol(list, listp, public).

See also

current_protocol/1, implements_protocol/2-3