#include <iostream>
#include <cstddef>
using namespace std;
 
#pragma pack(1)
struct STestPragmaPack {
  char c;
  long d;
} datasPP;
#pragma pack()
 
struct STestAttributPacked {
  char c;
  long d;
} __attribute__((packed)) datasAP;
 
struct STestAlignas {
  char c;
  alignas(char) long d;
} datasA;
 
int main() {
	cout << "pragma pack = " << sizeof(datasPP) << endl;
	cout << "attribute packed = " << sizeof(datasAP) << endl;
	cout << "alignas = " << sizeof(STestAlignas) << endl;
}

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