'''
Task Coach - Your friendly task manager
Copyright (C) 2004-2008 Frank Niessink <frank@niessink.com>
Task Coach 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.
Task Coach 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/>.
'''
# Module for metaclasses that are not widely recognized patterns.
class NumberedInstances(type):
''' A metaclass that numbers class instances. Use by defining the metaclass
of a class NumberedInstances, e.g.:
class Numbered:
__metaclass__ = NumberedInstances
Each instance of class Numbered will have an attribute instanceNumber
that is unique. '''
count = dict()
def __call__(class_, *args, **kwargs):
kwargs['instanceNumber'] = NumberedInstances.count.setdefault(class_, 0)
instance = super(NumberedInstances, class_).__call__(*args, **kwargs)
NumberedInstances.count[class_] += 1
return instance
|