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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. struct mystuff {
  5.     int a;
  6.     int b;
  7.     int c;
  8. };
  9.  
  10. #define declare_getstuff_for(f) int* get_mystuff_##f(struct mystuff *array, int n) \
  11. { \
  12.     int i; \
  13.     int *a_array; \
  14. \
  15.     a_array = malloc(n*sizeof(int)); \
  16. \
  17.     for(i=0;i<n;i++) { \
  18.         a_array[i] = array[i].f;  \
  19.     }  \
  20.     return a_array; \
  21. }
  22.  
  23. declare_getstuff_for(a)
  24. declare_getstuff_for(b)
  25. declare_getstuff_for(c)
  26.  
  27.  
  28. int main(void) {
  29. 	int *result1, *result2, *result3;
  30. 	struct mystuff array[3];
  31. 	struct mystuff el1, el2, el3;
  32. 	el1.a = el1.b = el1.c = 1;
  33. 	el2.a = el2.b = el2.c = 5;
  34. 	el3.a = el3.b = el3.c = 3;
  35.  
  36. 	array[0] = el1;
  37. 	array[1] = el2;
  38. 	array[2] = el3;
  39.  
  40. 	result1 = get_mystuff_a(array, 3);
  41. 	printf("%d, %d, %d\n", result1[0], result1[1], result1[2]);
  42.  
  43. 	result2 = get_mystuff_b(array, 3);
  44. 	printf("%d, %d, %d\n", result2[0], result2[1], result2[2]);
  45.  
  46. 	result3 = get_mystuff_c(array, 3);
  47. 	printf("%d, %d, %d\n", result3[0], result3[1], result3[2]);
  48.  
  49. 	// Now free your memory :)
  50.  
  51. 	return 0;
  52. }
  53.  
Success #stdin #stdout 0s 2380KB
comments (?)
stdin 
Standard input is empty
stdout 
1, 5, 3
1, 5, 3
1, 5, 3
https://ideone.com/bbYsJK
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

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