add mediator for c

Author: Jarry

iterator-pattern/README.md

@@ -228,5 +228,96 @@ func (o *ObjectList) Get(index int) string {
     }
 ```
 
+## C语言简版
+
+```c
+#include <stdio.h>
+#include <stdlib.h>
+
+// 简单版C语言迭代器模式，自己构建List数据类型
+
+// 数据结构，这里使用链表作为示例
+struct List
+{
+  char *data;
+  struct List *next;
+};
+
+// 迭代器结构体
+struct Iterator
+{
+  struct List *current;
+  int (*has_next)(struct Iterator *);        // 判断是否还有下一个元素
+  char *(*next)(struct Iterator *, char **); // 获取下一个元素
+};
+
+// 判断是否还有下一个元素
+int has_next(struct Iterator *iter)
+{
+  return iter->current != NULL;
+}
+
+// 获取下一个元素
+char *next(struct Iterator *iter, char **value)
+{
+  if (iter->current == NULL)
+  {
+    return NULL;
+  }
+  *value = iter->current->data;
+  iter->current = iter->current->next;
+  return *value;
+}
+
+// 初始化迭代器
+void create_iterator(struct Iterator *iter, struct List *head)
+{
+  iter->current = head;
+  iter->has_next = &has_next;
+  iter->next = &next;
+}
+
+// 遍历链表
+void iterate_list(struct List *head)
+{
+  struct Iterator iter;
+  char *value;
+  create_iterator(&iter, head);
+  while (iter.has_next(&iter))
+  {
+    iter.next(&iter, &value);
+    printf("\r\n %s ", value);
+  }
+  printf("\n");
+}
+
+int main()
+{
+  printf("test start:\r\n");
+  // 构造一个链表
+  struct List *head = (struct List *)malloc(sizeof(struct List));
+  head->data = "Tom";
+  head->next = (struct List *)malloc(sizeof(struct List));
+  head->next->data = "Jerry";
+  head->next->next = (struct List *)malloc(sizeof(struct List));
+  head->next->next->data = "Max";
+  head->next->next->next = NULL;
+
+  // 使用迭代器遍历链表
+  iterate_list(head);
+
+  // 释放链表内存
+  while (head != NULL)
+  {
+    struct List *temp = head;
+    head = head->next;
+    free(temp);
+  }
+
+  return 0;
+}
+
+```
+
 ## 更多语言版本
 不同语言实现设计模式：[https://github.com/microwind/design-pattern](https://github.com/microwind/design-pattern)

iterator-pattern/c/src/object_list.c

@@ -1,17 +1,17 @@
 #include "func.h"
 
-void set_objects(ObjectList *object_list, char **objects, int len)
+void object_list_set_objects(ObjectList *object_list, char **objects, int len)
 {
   object_list->length = len;
   object_list->objects = objects;
 }
 
-char **get_objects(ObjectList *object_list)
+char **object_list_get_objects(ObjectList *object_list)
 {
   return object_list->objects;
 }
 
-char *get(ObjectList *object_list, int index)
+char *object_list_get(ObjectList *object_list, int index)
 {
   return object_list->objects[index];
 }
@@ -30,9 +30,9 @@ ObjectList *object_list_constructor()
   ObjectList *list = (ObjectList *)obj;
   list->objects = NULL;
   list->length = 0;
-  list->set_objects = &set_objects;
-  list->get_objects = &get_objects;
-  list->get=&get;
+  list->set_objects = &object_list_set_objects;
+  list->get_objects = &object_list_get_objects;
+  list->get=&object_list_get;
   list->create_iterator = &create_iterator;
   return list;
 }