| # Copyright 2014 The Chromium Authors. All rights reserved. |
| # Use of this source code is governed by a BSD-style license that can be |
| # found in the LICENSE file. |
| |
| |
| # pylint: disable=C0301 |
| # Based on/taken from |
| # http://code.activestate.com/recipes/578231-probably-the-fastest-memoization-decorator-in-the-/ |
| # (with cosmetic changes). |
| # pylint: enable=C0301 |
| def memoize(f): |
| """Memoization decorator for a function taking a single argument.""" |
| class Memoize(dict): |
| def __missing__(self, key): |
| rv = self[key] = f(key) |
| return rv |
| return Memoize().__getitem__ |
