linux 泛型链表
时间: 2023-09-26 08:05:43 浏览: 52
Linux内核中的泛型链表是通过使用struct list_head来实现的。这个链表是一个循环双向结构,可以在链表的任意位置插入、删除和遍历节点。struct list_head定义在<LinuxList.h>头文件中,这个头文件提供了相关的增删改查API。它还依赖于其他头文件,包括<linux/types.h>、<linux/stddef.h>、<linux/poison.h>和<linux/prefetch.h>。这个链表的实现使用了GNU扩展的语法,如typeof关键字和双括号语法。如果需要在不支持GNU的平台上使用Linux内核链表,可以移除这些扩展语法并省略prefetch()函数,这不会影响链表的正常使用,只会增加一些调用时的安全风险。
相关问题
c++实现泛型循环链表
可以使用 void 指针来实现泛型循环链表,具体实现方法可以参考以下代码:
```
typedef struct node {
void *data;
struct node *next;
} Node;
typedef struct {
Node *head;
Node *tail;
int size;
} List;
List *list_create() {
List *list = (List *)malloc(sizeof(List));
list->head = NULL;
list->tail = NULL;
list->size = ;
return list;
}
void list_add(List *list, void *data) {
Node *node = (Node *)malloc(sizeof(Node));
node->data = data;
node->next = NULL;
if (list->head == NULL) {
list->head = node;
list->tail = node;
node->next = node;
} else {
list->tail->next = node;
node->next = list->head;
list->tail = node;
}
list->size++;
}
void list_remove(List *list, void *data) {
Node *prev = list->tail;
Node *curr = list->head;
int i;
for (i = ; i < list->size; i++) {
if (curr->data == data) {
if (curr == list->head) {
list->head = curr->next;
list->tail->next = list->head;
} else if (curr == list->tail) {
list->tail = prev;
list->tail->next = list->head;
} else {
prev->next = curr->next;
}
free(curr);
list->size--;
return;
}
prev = curr;
curr = curr->next;
}
}
void list_destroy(List *list) {
Node *curr = list->head;
int i;
for (i = ; i < list->size; i++) {
Node *temp = curr;
curr = curr->next;
free(temp);
}
free(list);
}
```
以上代码实现了一个泛型循环链表,可以存储任意类型的数据。
帮我写一个c++泛型循环链表
好的,我可以为您提供一个C语言的泛型循环链表实现。以下是代码示例:
```
#include <stdio.h>
#include <stdlib.h>
typedef struct node {
void *data;
struct node *next;
} Node;
typedef struct list {
Node *head;
Node *tail;
int size;
} List;
List *createList() {
List *list = (List *)malloc(sizeof(List));
list->head = NULL;
list->tail = NULL;
list->size = ;
return list;
}
void add(List *list, void *data) {
Node *newNode = (Node *)malloc(sizeof(Node));
newNode->data = data;
newNode->next = NULL;
if (list->size == ) {
list->head = newNode;
list->tail = newNode;
newNode->next = list->head;
} else {
list->tail->next = newNode;
list->tail = newNode;
newNode->next = list->head;
}
list->size++;
}
void removeNode(List *list, Node *node) {
if (list->size == ) {
return;
}
if (node == list->head) {
list->head = node->next;
list->tail->next = list->head;
} else {
Node *current = list->head;
while (current->next != node) {
current = current->next;
}
current->next = node->next;
if (node == list->tail) {
list->tail = current;
}
}
free(node);
list->size--;
}
void *get(List *list, int index) {
if (index < || index >= list->size) {
return NULL;
}
Node *current = list->head;
for (int i = ; i < index; i++) {
current = current->next;
}
return current->data;
}
void destroyList(List *list) {
while (list->size > ) {
removeNode(list, list->head);
}
free(list);
}
int main() {
List *list = createList();
int a = 1;
float b = 2.;
char c = 'c';
add(list, &a);
add(list, &b);
add(list, &c);
printf("%d\n", *(int *)get(list, ));
printf("%f\n", *(float *)get(list, 1));
printf("%c\n", *(char *)get(list, 2));
destroyList(list);
return ;
}
```
这个泛型循环链表可以存储任意类型的数据,只需要将数据的地址传递给add函数即可。您可以根据需要修改代码以适应您的具体应用场景。