design_patterns
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design_patterns [2012/06/10 14:10] mantis [Singleton] |
design_patterns [2012/06/10 14:10] (current) mantis |
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| + | ===== Constructor ===== | ||
| + | ===== Decorator ===== | ||
| + | |||
| + | ===== Null object ===== | ||
| + | |||
| + | ===== Observer ===== | ||
| + | |||
| + | ===== Proxy ===== | ||
| + | |||
| + | ===== Singleton ===== | ||
| + | |||
| + | Aka Borg pattern | ||
| + | |||
| + | <code python> | ||
| + | |||
| + | class Singleton: | ||
| + | __shared_state = {} | ||
| + | def __init__(self): | ||
| + | self.__dict__ = self.__shared_state | ||
| + | |||
| + | s1 = Singleton() | ||
| + | s1.x = 1 | ||
| + | s2 = Singleton() | ||
| + | s2.x # 1 | ||
| + | </code> | ||
design_patterns.txt ยท Last modified: 2012/06/10 14:10 by mantis
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