23 lines
520 B
Python
23 lines
520 B
Python
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"""
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Singleton decorator definition
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"""
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from functools import wraps
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def Singleton(cls):
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"""
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Decorator implementing the singleton pattern:
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it restricts the instantiation of a class to one "single" instance.
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"""
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instances = {}
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# https://github.com/sphinx-doc/sphinx/issues/3783
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@wraps(cls)
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def getinstance():
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"""Find an instance or save newly created one"""
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if cls not in instances:
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instances[cls] = cls()
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return instances[cls]
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return getinstance
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