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41 lines
1.1 KiB
Python
41 lines
1.1 KiB
Python
import weakref
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class _weak_callable:
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def __init__(self, obj, func):
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self.im_self = obj
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self.im_func = func
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def __call__(self, *args, **kws):
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if self.im_self is None:
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return self.im_func(*args, **kws)
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else:
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return self.im_func(self.im_self, *args, **kws)
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class WeakMethod:
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""" Wraps a function or, more importantly, a bound method in
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a way that allows a bound method's object to be GCed, while
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providing the same interface as a normal weak reference. """
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def __init__(self, fn):
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try:
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self._obj = weakref.ref(fn.im_self)
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self._meth = fn.im_func
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except AttributeError:
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# It's not a bound method
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self._obj = None
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self._meth = fn
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def __call__(self):
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if self._dead():
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return None
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return _weak_callable(self._getobj(), self._meth)
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def _dead(self):
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return self._obj is not None and self._obj() is None
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def _getobj(self):
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if self._obj is None:
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return None
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return self._obj()
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