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from weakref import ref
class GcWeakrefs(object):
# code copied and adapted from WeakKeyDictionary.
def __init__(self, ffi):
self.ffi = ffi
self.data = data = {}
def remove(k):
destructor, cdata = data.pop(k)
destructor(cdata)
self.remove = remove
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)
self.data[ref(new_cdata, self.remove)] = destructor, cdata
return new_cdata
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