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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 illustrates that the implementation of dynamic predicates must ensure that retracting all local clauses for an inherited dynamic predicate restores the visibility of any inherited definition. This also have direct consequences for the implementation and optimization of (^^)/1 calls. For more information on this example, please see the comments in the example source files. The example is inspired by the "Now You See Me" movie, whose main characters are four stage magicians known as the "Four Horsemen".