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  1. #include <stdio.h>
  2. #include <stdint.h>
  3. #include <stdlib.h>
  4. #include <memory.h>
  5. #include <stdbool.h>
  6. //#include <crtdbg.h>//vc only
  7. typedef struct Hoge {
  8. 	int32_t* p;
  9. 	size_t N;
  10.  
  11. 	int32_t*(*Index)(struct Hoge*, size_t);
  12. 	bool(*Resize)(struct Hoge*, size_t);
  13. 	void(*Destruct)(struct Hoge*);
  14. }Hoge;
  15.  
  16. static int32_t* Idx(Hoge* H, size_t N) {
  17. 	if (H->N <= N) return NULL;
  18.  
  19. 	return &H->p[N];
  20. }
  21.  
  22. static bool Rsz(Hoge* H, size_t N) {
  23. 	int32_t *P = NULL;
  24. 	size_t C = H->N;
  25.  
  26. 	if (H->N == N)return false;
  27.  
  28. 	P = calloc(N, sizeof(int32_t));
  29. 	if (P != NULL) {
  30. 		if (C > N)C = N;
  31. 		//memcpy_s(P, N * sizeof(int32_t), H->p, C * sizeof(int32_t));
  32. 		memcpy(P, H->p, C * sizeof(int32_t));
  33. 		free(H->p);
  34. 		H->p = P;
  35. 		H->N = N;
  36. 	}
  37. 	else {
  38. 		return false;
  39. 	}
  40. 	return true;
  41. }
  42. static void DestructHoge(Hoge* H) {
  43.  
  44. 	free(H->p);
  45. 	H->p = NULL;
  46. 	H->N = 0;
  47. 	return;
  48. }
  49.  
  50. Hoge ConsutructHoge(size_t N) {
  51. 	Hoge H;
  52. 	H.Index = Idx;
  53. 	H.Resize = Rsz;
  54. 	H.Destruct = DestructHoge;
  55.  
  56. 	H.p = calloc(N, sizeof(int32_t));
  57. 	H.N = 0;
  58. 	if (H.p != NULL) H.N = N;
  59.  
  60. 	return H;
  61. }
  62.  
  63. int main() {
  64. 	//_CrtSetDbgFlag(_CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF);
  65. 	Hoge H = ConsutructHoge(16);
  66.  
  67. 	(*H.Index(&H, 8)) = 256;
  68.  
  69. 	for (size_t i = 0; i < H.N; i++) {
  70. 		printf("%d ", (*H.Index(&H, i)));
  71. 	}
  72. 	printf("\n");
  73. 	H.Resize(&H, 32);
  74. 	(*H.Index(&H, 7)) = 256;
  75. 	for (size_t i = 0; i < H.N; i++) {
  76. 		printf("%d ", (*H.Index(&H, i)));
  77. 	}
  78. 	printf("\n");
  79. 	H.Resize(&H, 8);
  80.  
  81. 	for (size_t i = 0; i < H.N; i++) {
  82. 		printf("%d ", (*H.Index(&H, i)));
  83. 	}
  84. 	printf("\n");
  85. 	H.Destruct(&H);
  86.  
  87. 	return 0;
  88.  
  89. }
Success #stdin #stdout 0s 9424KB
comments (?)
stdin
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Standard input is empty
stdout
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0 0 0 0 0 0 0 0 256 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 256 256 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 256
https://ideone.com/ZfcWrq
language:
C (gcc 8.3)
created:
8 years ago
visibility:
public

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