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from weakref import ref
class GcWeakrefs(object):
def __init__(self, ffi):
self.ffi = ffi
self.data = {}
def build(self, cdata, destructor):
# make a new cdata of the same type as the original one
new_cdata = self.ffi.cast(self.ffi._backend.typeof(cdata), cdata)
#
def remove(key):
# careful, this function is not protected by any lock
old_key = self.data.pop(index)
assert old_key is key
destructor(cdata)
#
key = ref(new_cdata, remove)
index = object()
self.data[index] = key
return new_cdata