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  1. #include <stdio.h>
  2. #define BYPASS NULL
  3. typedef void(*callback)(int key,void* val);
  4. typedef int(*predicate)(void* elem1,void* elem2);
  5.  
  6.  
  7. void call_where(
  8. 	void *arr,
  9. 	int elemCount,
  10. 	int elemSize,
  11. 	callback call,
  12. 	predicate when,
  13. 	void* elem
  14. 	)
  15. {
  16. 	int i;
  17. 	for(i = 0; i < elemCount; i++)
  18. 		if(when == BYPASS 
  19. 			|| when(elem, (char*)arr + i * elemSize) )
  20. 			call(i, (char*)arr + i * elemSize);
  21. }
  22.  
  23.  
  24.  
  25. void IntRandom(int key, void* val)
  26. {
  27. 	*(int*)val = rand()%10;
  28. }
  29. void IntPrint(int key, void* val)
  30. {
  31. 	printf("%d => %d\n",key,*(int*)val);
  32. }
  33. int IntEquals(void* a, void* b)
  34. {
  35. 	return *(int*)a == *(int*)b;
  36. }
  37. int main()
  38. {
  39.  
  40. 	int arr[50];
  41. 	int searchFor = 3;
  42. 	call_where(arr,50,sizeof(int),IntRandom,BYPASS,BYPASS);
  43. 	printf("Init Array\n");
  44. 	call_where(arr,50,sizeof(int),IntPrint,BYPASS,BYPASS);
  45. 	printf("Found 3 at\n");
  46. 	call_where(arr,50,sizeof(int),IntPrint,IntEquals,&searchFor);
  47.  
  48. 	return 0;
  49. }
  50.  
Success #stdin #stdout 0s 2248KB
comments (?)
stdin
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Standard input is empty
stdout
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Init Array
0 => 3
1 => 6
2 => 7
3 => 5
4 => 3
5 => 5
6 => 6
7 => 2
8 => 9
9 => 1
10 => 2
11 => 7
12 => 0
13 => 9
14 => 3
15 => 6
16 => 0
17 => 6
18 => 2
19 => 6
20 => 1
21 => 8
22 => 7
23 => 9
24 => 2
25 => 0
26 => 2
27 => 3
28 => 7
29 => 5
30 => 9
31 => 2
32 => 2
33 => 8
34 => 9
35 => 7
36 => 3
37 => 6
38 => 1
39 => 2
40 => 9
41 => 3
42 => 1
43 => 9
44 => 4
45 => 7
46 => 8
47 => 4
48 => 5
49 => 0
Found 3 at
0 => 3
4 => 3
14 => 3
27 => 3
36 => 3
41 => 3
https://ideone.com/1oEtBm
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

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