{

PyObject_VAR_HEAD

PyObject* dict;

PyObject* weakrefs;

instance_holder* objects;

typedef typename boost::python::detail::type_with_alignment<

boost::python::detail::alignment_of<Data>::value

>::type align_t;

union

{

align_t align;

char bytes[sizeof(Data)];

} storage;

{

typedef instance<Data> instance_data;

typedef instance<char> instance_char;

BOOST_STATIC_CONSTANT(std::size_t,

value = sizeof(instance_data) -

BOOST_PYTHON_OFFSETOF(instance_char,storage) +

boost::python::detail::alignment_of<Data>::value);