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This file is part of Logtalk https://logtalk.org/ SPDX-FileCopyrightText: 1998-2023 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.

To load this example and for sample queries, please see the SCRIPT.txt file.

This folder contains two examples that show how to use a category to explicitly complement existing objects (without modifying its source code), thus providing functionality similar to Objective-C categories.

The complemented objects need to be compiled with the flag complements set to either allow or restrict (its default value is deny; this solution was adapted to improve performance of applications that doesn't use complementing categories and to provide a solution for preventing the use of categories to break object encapsulation). Note that the complements flag can be set on a per-object basis as in this example.