GNU GENERAL PUBLIC LICENSE
                      Version 3, 29 June 2007

    A subclass of python's builtin property class that removes boilerplate by implementing the h_hidden_attribute pattern with a single decorator call. Also afacilitates invalidation of the cached hidden attribute with a @cacheproperty.invalidate decorator on any other methods or properties in a class.
    Copyright (C) 2018  Matthew Hawthorn

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.

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