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  1. #include <stdio.h>
  2.  
  3. #define STATIC_ASSERT(COND) typedef char static_assertion_##__LINE__[(COND) ? 1 : -1]
  4. #define ENSURE_SIZE(structure, size) STATIC_ASSERT(sizeof(structure) == size)
  5.  
  6. typedef struct
  7. {
  8. 	unsigned a;
  9. } foo;
  10. ENSURE_SIZE(foo, sizeof(unsigned));
  11.  
  12. int main(void) {
  13. 	unsigned local_a = 0;
  14. 	foo *f = (foo *)(&local_a);
  15. 	printf("address local_a: %X, f->a: %X\n", &local_a, &f->a);
  16. 	return 0;
  17. }
  18.  
Success #stdin #stdout 0s 2156KB
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Standard input is empty
stdout
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address local_a: BF92B2BC, f->a: BF92B2BC
https://ideone.com/Czm68c
language:
C (gcc 8.3)
created:
7 years ago
visibility:
secret

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