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This file is part of Logtalk <https://logtalk.org/>  
Copyright 1998-2021 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.
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This directory contains two versions, one prototype-based and the 
other one class-based, of a very simple geometric shapes hierarchy.

The aim of this example is to compare the pros and cons of using 
either prototypes or classes for defining object hierarchies.

- `ph`  
	prototype-based version
- `ch`  
	class-based version

Both versions define the following hierarchy of objects:

	shape
		polygon
			regular_polygon
				square
					q1
					q2
