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# Copyright 2017 Lars Wirzenius
#
# 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/>.
#
# =*= License: GPL-3+ =*=
class CowDelta(object):
def __init__(self):
self._dict = {}
def __contains__(self, key):
return key in self._dict
def keys(self):
return self._dict.keys()
def set(self, key, value):
self._dict[key] = value
def get(self, key):
return self._dict[key]
def remove(self, key):
self._dict[key] = removed_key
removed_key = object()
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