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Pack logtalk -- logtalk-3.77.0/manuals/_sources/refman/predicates/conforms_to_protocol_2_3.rst.txt |
.. This file is part of Logtalk https://logtalk.org/ SPDX-FileCopyrightText: 1998-2024 Paulo Moura <pmoura@logtalk.org> SPDX-License-Identifier: Apache-2.0
Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
.. rst-class:: align-right
built-in predicate
.. index:: pair: conforms_to_protocol/2-3; Built-in predicate .. _predicates_conforms_to_protocol_2_3:
conforms_to_protocol/2-3
::
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.
::
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
| 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)
::
% 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)
.
.. seealso::
:ref:predicates_current_object_1
,
:ref:predicates_current_protocol_1
,
:ref:predicates_current_category_1
,
:ref:predicates_implements_protocol_2_3