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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 a very simple example of using the compiler flag hook/1 and the term expansion mechanism to either discard or activate debugging goals. For debugging goals in clause bodies, one defines clauses for goal_expansion/2. For debugging goals in directives (e.g. in the initialization/1 directive), one defines clauses for term_expansion/2.

We can use two hook objects, one for developing and debugging code and one for production code, or a single parametric object. This example illustrates both approaches although only the first one is used in the loader auxiliary files and in the sample queries.