[Pyrex] wrapping structs containing pointers and functions that allocate memory to a pointer

[Nathaniel Haggard]

void add_arg(alpha *args)  is the function to wrap.  

struct alpha {
    char *name;
    alpha *next;
    void *otherptr
}

add_arg allocates memory and assigns args to point to it.  

In making the extension class pyrexc gives errors about not being able
to convert Python object to alpha (*) and the same error for void (*).

Evidently this is not the way,

def setnext(self, next):
       self.next = next


How should I wrap this struct?  How should I wrap functions that
return pointers and modify pointers to this struct?