1  typedef unsigned uint32_t;
       2  typedef unsigned char uint8_t;
       3  typedef unsigned short uint16_t;
       4  typedef struct {
       5   uint32_t mbxOwner:1;
       6   uint32_t mbxHc:1;
       7   uint32_t mbxReserved:6;
       8   uint32_t mbxCommand : 8;
       9   uint32_t mbxStatus : 16;
      10  } MAILBOX_t;
      11  uint32_t f(void) {
      12         uint32_t mbox;
      13   mbox = 0;
      14   ((MAILBOX_t *)&mbox)->mbxCommand = 0x24;
      15   ((MAILBOX_t *)&mbox)->mbxOwner = 1;
      16  return mbox;
      17  }