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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 example requires using SWI-Prolog 7.x as the backend Prolog compiler. It illustrates using a SWI-Prolog native dictionary term for representing a parametric object parameters. This is accomplished simply by passing a dict as the single object parameter.

Know issue

Don't use dot notation, ./2, when working with dicts within objects and categories. SWI-Prolog provides different semantics for compiled versus asserted clauses that contain ./2 terms and that can clash with Logtalk dynamic binding caching and inlining optimizations (usually resulting in instantiation errors).