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| 1 # Copyright 2014 The Chromium Authors. All rights reserved. | |
| 2 # Use of this source code is governed by a BSD-style license that can be | |
| 3 # found in the LICENSE file. | |
| 4 | |
| 5 import sys | |
| 6 | |
| 7 # pylint: disable=C0301 | |
| 8 # Based on/taken from | |
| 9 # http://code.activestate.com/recipes/578231-probably-the-fastest-memoization-
decorator-in-the-/ | |
| 10 # (with cosmetic changes). | |
| 11 # pylint: enable=C0301 | |
| 12 def memoize(f): | |
| 13 """Memoization decorator for a function taking a single argument.""" | |
| 14 class Memoize(dict): | |
| 15 def __missing__(self, key): | |
| 16 rv = self[key] = f(key) | |
| 17 return rv | |
| 18 return Memoize().__getitem__ | |
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