kopia lustrzana https://github.com/peterhinch/micropython-samples
45 wiersze
1.1 KiB
Python
45 wiersze
1.1 KiB
Python
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def functor(cls):
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instance = None
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def getinstance(*args, **kwargs):
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nonlocal instance
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if instance is None:
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instance = cls(*args, **kwargs)
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return instance
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return instance(*args, **kwargs)
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return getinstance
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def singleton(cls):
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instance = None
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def getinstance(*args, **kwargs):
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nonlocal instance
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if instance is None:
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instance = cls(*args, **kwargs)
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return instance
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return getinstance
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@singleton
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class MySingleton:
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def __init__(self, arg):
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self.state = arg
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print('In __init__', arg)
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def foo(self, arg):
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print('In foo', arg + self.state)
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ms = MySingleton(42) # prints 'In __init__ 42'
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a = MySingleton(99) # No output: assign existing instance to a
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a.foo(5) # prints 'In foo 47': original state + 5
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@functor
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class MyFunctor:
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def __init__(self, arg):
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self.state = arg
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print('In __init__', arg)
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def __call__(self, arg):
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print('In __call__', arg + self.state)
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MyFunctor(42) # prints 'In __init__ 42'
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MyFunctor(5) # 'In __call__ 47'
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