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.. rst-class:: align-right

built-in predicate

.. index:: pair: protocol_property/2; Built-in predicate .. _predicates_protocol_property_2:

protocol_property/2

Description

::

protocol_property(Protocol, Property)

Enumerates, by backtracking, the properties associated with the currently defined protocols. The valid properties are listed in the language grammar section on :ref:`entity properties <grammar_entity_properties>` and described in the User Manual section on :ref:`protocol properties <protocols_properties>`.

Modes and number of proofs

::

protocol_property(?protocol_identifier, ?protocol_property) - zero_or_more

Errors

| Protocol is neither a variable nor a valid protocol identifier: | type_error(protocol_identifier, Protocol) | Property is neither a variable nor a callable term: | type_error(callable, Property) | Property is a callable term but not a valid protocol property: | domain_error(protocol_property, Property)

Examples

::

% enumerate the properties of the monitoring built-in protocol: | ?- protocol_property(monitoring, Property).

Property = source_data ; Property = static ; Property = built_in ; ...

.. seealso::

:ref:predicates_abolish_protocol_1, :ref:predicates_create_protocol_3, :ref:predicates_current_protocol_1, :ref:predicates_conforms_to_protocol_2_3, :ref:predicates_extends_protocol_2_3, :ref:predicates_implements_protocol_2_3