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  1. #include <iostream>
  2. #include <cstddef>
  3. using namespace std;
  4.  
  5. struct Inner_S
  6. {
  7.   double a;
  8.   double b[4][4];
  9. };
  10.  
  11. #pragma pack(1)
  12. struct Packed_S
  13. {
  14.   uint8_t c;
  15.   Inner_S d;
  16. };
  17.  
  18. int main() {
  19. 	cout << "Size: " << sizeof(Packed_S) << endl;
  20. 	cout << "c offset: " << offsetof(Packed_S, c) << endl;
  21. 	cout << "d offset: " << offsetof(Packed_S, d) << endl;
  22. 	cout << "a offset: " << offsetof(Packed_S, d.a) << endl;
  23. 	cout << "b offset: " << offsetof(Packed_S, d.b) << endl;
  24. 	return 0;
  25. }
Success #stdin #stdout 0s 3296KB
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stdin
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Standard input is empty
stdout
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Size: 137
c offset: 0
d offset: 1
a offset: 1
b offset: 9
https://ideone.com/NFhtmD
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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