#include <stdio.h>static class sss {public:  char m;  virtual int f (int i) {return i;}} sss;#define _offsetof(st,f) ((char *)&((st *) 16)->f - (char *) 16)int main (void) {  printf ("+++Class starting with char and containing virtual function:\n");  printf ("size=%d,align=%d\n", sizeof (sss), __alignof__ (sss));  printf ("offset-m=%d,align-m=%d\n",          _offsetof (class sss, m), __alignof__ (sss.m));}