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  1. #include <iostream>
  2.  
  3.  
  4. #define CHECK_ALIGNMENT(arg) \
  5.     std::cout << #arg << ": " << (reinterpret_cast<long>(&arg) % sizeof(int)) << std::endl;
  6.  
  7.  
  8. int main()
  9. {
  10.     std::cout << "GCC version: " << __VERSION__ << std::endl;
  11.  
  12.     char c = 'a';    
  13.     unsigned char data[16];
  14.     CHECK_ALIGNMENT(c);
  15.     CHECK_ALIGNMENT(data[0]);
  16.     CHECK_ALIGNMENT(data[4]);
  17.     CHECK_ALIGNMENT(data[8]);
  18.     CHECK_ALIGNMENT(data[12]);
  19. }
Success #stdin #stdout 0.01s 2680KB
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stdin
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Standard input is empty
stdout
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GCC version: 4.3.4
c: 3
data[0]: 3
data[4]: 3
data[8]: 3
data[12]: 3
https://ideone.com/Q30G2x
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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