#include <iostream>
using namespace std;
#include <stdint.h>
#include <stdio.h>
typedef struct structTag {
union {
struct {
uint32_t messageID : 26; /* 26bit message id, 67108864 ids */
uint8_t priority : 3; /* priority: MUST BE 0 */
} __attribute__ ((packed));
uint32_t rawID : 29;
uint8_t canFlags : 3;
} __attribute__ ((packed));
} __attribute__ ((packed)) idSpecial;
int main() {
printf("size: %d", sizeof(idSpecial));
return 0;
}
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