cython

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cdef class C:
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    cdef int i
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    def foo(self):
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        self.i = 42
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    def get_i(self):
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        return self.i
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def cast_cast_cast(arg):
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    """
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    >>> x = C()
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    >>> x.foo()
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    >>> cast_cast_cast(x) == x
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    True
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    >>> x.get_i()
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    42
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    """
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    cdef object x
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    cdef void *p = <void *>arg
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    cdef int i
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    x = <object>p
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    p = <void *>x
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    x = (<object>p).foo
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    i = (<C>p).i
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    (<C>p).i = i
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    return <object>p
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