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30 lines
764 B
C++
30 lines
764 B
C++
#!/usr/bin/python
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# -*- coding: utf8 -*-
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# cp936
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#==========================================================
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# History
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# 1. 20200822, Added by fasiondog
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#==========================================================
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import threading
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class SingletonType(type):
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"""基于 metalclass 实现单例
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示例：
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class MyClass(metaclass=SingletonType):
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def __init__(self,name):
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self.name = name
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"""
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_instance_lock = threading.Lock()
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def __call__(cls, *args, **kwargs):
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if not hasattr(cls, "_instance"):
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with SingletonType._instance_lock:
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if not hasattr(cls, "_instance"):
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cls._instance = super(SingletonType, cls).__call__(*args, **kwargs)
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return cls._instance
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