cffi / cffi /

Armin Rigo a8efbdc 

from weakref import ref

class GcWeakrefs(object):
    # code copied and adapted from WeakKeyDictionary.

    def __init__(self, ffi):
        self.ffi = ffi = data = {}
        def remove(k):
            destructor, cdata = data.pop(k)
        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.typeof(cdata), cdata)[ref(new_cdata, self.remove)] = destructor, cdata
        return new_cdata
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