20 lines
586 B
Python
20 lines
586 B
Python
from weakref import ref
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class GcWeakrefs(object):
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# code copied and adapted from WeakKeyDictionary.
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def __init__(self, ffi):
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self.ffi = ffi
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self.data = data = {}
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def remove(k):
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destructor, cdata = data.pop(k)
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destructor(cdata)
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self.remove = remove
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def build(self, cdata, destructor):
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# make a new cdata of the same type as the original one
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new_cdata = self.ffi.cast(self.ffi._backend.typeof(cdata), cdata)
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self.data[ref(new_cdata, self.remove)] = destructor, cdata
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return new_cdata
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