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.. 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
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.. rst-class:: align-right
built-in predicate
.. index:: pair: specializes_class/2-3; Built-in predicate .. _predicates_specializes_class_2_3:
specializes_class/2-3
::
specializes_class(Class, Superclass)
specializes_class(Class, Superclass, Scope)
Enumerates, by backtracking, all pairs of objects such that the first
one specializes the second. The relation scope is represented by the
atoms public
, protected
, and private
.
::
specializes_class(?object_identifier, ?object_identifier) - zero_or_more specializes_class(?object_identifier, ?object_identifier, ?scope) - zero_or_more
| Class
is neither a variable nor a valid object identifier:
| type_error(object_identifier, Class)
| Superclass
is neither a variable nor a valid object identifier:
| type_error(object_identifier, Superclass)
| 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 the state_space subclasses:
| ?- specializes_class(Subclass, state_space)
.
% enumerate the state_space subclasses where the
% specialization relation is public:
| ?- specializes_class(Subclass, state_space, public)
.
.. seealso::
:ref:predicates_current_object_1
,
:ref:predicates_extends_object_2_3
,
:ref:predicates_instantiates_class_2_3