# Copyright (C) 2012  Roman Zimbelmann <romanz@lavabit.com>
#
# 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/>.

def cached_function(fnc):
  cache = {}
  def inner_cached_function(self, *args):
    try:
      return cache[args]
    except:
      value = fnc(self, *args)
      cache[args] = value
      return value
  inner_cached_function._cache = cache
  return inner_cached_function