C语言实现《大话设计模式》中的观察者模式中的委托例程
1. #ifndef __ENTRUSTOBSERVER_H__
2. #define __ENTRUSTOBSERVER_H__
3. #include "rtthread.h"
4. #include "finsh.h"
5. //根据类名和类里面项的名，获得类的入口句柄
6. #define ClassEntry(node, type, member) \
7. ((type *)((char *)(node) - (unsigned long)(&((type *)0)->member)))
8. //LIST数组
9. typedef struct _List List;
10. struct _List
11. {
12. void **pListPointArray; //LIST数组指针
13. int Total; //元素个数
14. void (*Add)(List *pList, void *pListPoint); //添加
15. void (*Remove)(List *pList, void *pListPoint); //移除
16. void (*Delete)(void *pList); //析构
17. };
18. //List类的析构函数
19. static void ListDelete(void *pList)
20. {
21. if(((List *)pList)->pListPointArray != RT_NULL) //先释放指针数组
22. {
23. rt_free(((List *)pList)->pListPointArray);
24. }
25. rt_free(pList); //再释放整个List类
26. }
27. //元素增加函数
28. static void ListAdd(List *pList, void *pListPoint)
29. {
30. void **tListPointArray = rt_malloc(sizeof(int *) * (pList->Total + 1)); //申请比原来大一个存储单元的内存
31. int pListIndex;
32. for(pListIndex = 0; pListIndex < pList->Total; pListIndex++) //拷贝
33. {
34. if(pList->pListPointArray[pListIndex] == pListPoint) //判断，如果有相同的元素存在
35. {
36. rt_free(tListPointArray); //释放现申请的内存
37. return; //返回
38. }
39. tListPointArray[pListIndex] = pList->pListPointArray[pListIndex]; //拷贝
40. }
41. tListPointArray[pList->Total] = pListPoint; //将添加的元素放到最后一个存储单元中
42. pList->Total += 1; //总数加1
43. if(pList->pListPointArray != RT_NULL) rt_free(pList->pListPointArray); //释放原来的内存
44. pList->pListPointArray = tListPointArray; //将新的句柄替换原句柄
45. }
46. //元素移除函数
47. static void ListRemove(List *pList, void *pListPoint)
48. {
49. int pListIndex, tListIndex;
50. void **tListPointArray;
51. void **FreePointArray;
52. void **SavePointArray;
53. if(pList->Total == 0) return; //总数为0时退出
54. tListPointArray = rt_malloc(sizeof(int) * (pList->Total - 1)); //申请比原来小一个存储单元的内存
55. FreePointArray = tListPointArray; //将刚申请的内存空间作为默认的释放空间
56. SavePointArray = pList->pListPointArray; //将已有的内存空间作为默认的存储空间
57. for(pListIndex = 0, tListIndex= 0; pListIndex < pList->Total; pListIndex++) //查找移除点
58. {
59. if(pList->pListPointArray[pListIndex] == pListPoint) //当前点是移除点
60. {
61. FreePointArray = pList->pListPointArray; //改变释放内存指针
62. SavePointArray = tListPointArray; //改变保留内存指针
63. continue; &nb
补充：软件开发 , C语言 ,
