[pypy-dev] Pypy friendly to get pointer enclosed in python object ?

PyCairo has a struct like `    typedef struct { |    PyObject_HEAD | | |      cairo_t *ctx; | | |     PyObject *base; /* base object used to create context, or NULL */ | |     } PycairoContext; ` And a #define that you can use to get pointer to ctx: `    #define PycairoContext_GET(obj) (((PycairoContext *)(obj))->ctx)` How can I get hold of the pointer *ctx in Pypy ? I had a bit of a look at CFFI, but couldn't find anything using structures with PyObject_HEAD in them. S++