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  1. static_assert(sizeof(char) == 1, "sizeof(char) != 1");
  2. union U1
  3. {
  4.   int i;
  5.   char c[sizeof(int)];
  6. };  
  7. union U2
  8. { 
  9.   char c[sizeof(int)];
  10.   int i;
  11. };  
  12.  
  13. constexpr U1 u1 = {1};
  14. constexpr U2 u2 = {{1}};
  15. constexpr bool IsLittleEndian ()
  16. { 
  17.   return u1.i == u2.c[0];
  18. }   
  19.  
  20. int main ()
  21. { 
  22.   static_assert(IsLittleEndian(), "The machine is BIG endian");
  23. }
  24.  
Success #stdin #stdout 0s 3464KB
comments ()
stdin 
Standard input is empty
stdout 
Standard output is empty
https://ideone.com/TtKRWQ
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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