Something

#include <stdio.h>

typedef enum {
  One, Two, Three
} hi;

typedef struct {
  hi k;

  union {
      void* boo;
      int i32;
      long l;
      double d;
  } u;
} foo;

int main()
{
  printf ("foo size = %d\n", sizeof (foo));
  printf ("k offset = %d\n", &((foo*)NULL)->k);
  printf ("u offset = %d\n", &((foo*)NULL)->u);
  printf ("u.boo offset = %d\n", &((foo*)NULL)->u.boo);
  printf ("u.d offset = %d\n", &((foo*)NULL)->u.d);
}