循环链表
循环链表介绍
循环链表是另一种形式的链表，它提供了更为灵活的遍历表元素的能力。循环链表可以是单向的或双向的，但区分一个链表是不是循环链表只要看它有没有尾部元素即可。在循环链表中，最后一个元素的next指针又指回头元素而不是设置为NULL。在双向循环链表中，头元素的prev指针则指向最后一个元素，这使得循环链表中的每个元素既可以看做头元素也可以看做尾元素。遍历循环链表可以从任何一个元素位置开始。
单向循环链表的实现
// CList.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <malloc.h>
/*循环链表元素结构体定义*/
typedef struct CListElmt_
{
unsigned int uiValueA; /*数据域 数据成员*/
unsigned int *puiValueB; /*数据域 数据成员，需要动态申请内存*/
struct CListElmt_ *pNext; /*指针域 指向后一个元素结点的指针*/
}CListElmt;
/*循环链表结构体定义*/
typedef struct CList_
{
int iSize; /*链表大小*/
void (*destory)(void *data); /*用于释放元素结点内动态申请的内存*/
int (*compare)(void *key1, void *key2); /*比较函数 返回值 0 相等 1 大于 -1 小于*/
CListElmt *pCListElmtHead; /*指向链表头结点的指针*/
/*循环链表无尾结点指针*/
}CList;
/*循环链表操作宏定义*/
#define CLIST_SIZE(clist) ((clist)->iSize)
#define CLIST_HEAD(clist) ((clist)->pCListElmtHead)
/*函数声明*/
void MemoryFree(void *data);
int DataCompare(void *key1, void *key2);
void CList_Init(CList *clist, void (*destory)(void *data), int (*compare)(void *key1, void *key2));
int CList_Insert_Next(CList *clist, CListElmt *Lelement, unsigned int uiDataA, unsigned int *puiDataB);
int CList_Remove_Next(CList *clist, CListElmt *Lelement, unsigned int *puiDataA, unsigned int **puiDataB);
void CList_Destory(CList *clist);
/*
*函数名：MemoryFree
*参数：data 待释放的内存
*功能：释放动态申请的内存
*返回值：无
*作者：AlbertoNo1
*日期：2016-04-20
*/
void MemoryFree(void *data)
{
free(data);
}
/*
*函数名：DataCompare
*参数：key1 待比较的元素1
* key2 待比较的元素2
*功能：比较两个元素的大小（无符号整型）
*返回值：0 key1 等于 key2 1 key1 大于 key2 -1 key1 小于 key2
*作者：AlbertoNo1
*日期：2016-04-20
*/
int DataCompare(void *key1, void *key2)
{
unsigned int uiKey1 = 0;
unsigned int uiKey2 = 0;
uiKey1 = *((unsigned int*)key1);
uiKey2 = *((unsigned int*)key2);
if (uiKey1 < uiKey2)
{
return -1;
}
else if (uiKey1 > uiKey2)
{
return 1;
}
else
{
return 0;
}
}
/*
*函数名：CList_Init
*参数：clist 待初始化的链表
* destory 数据域动态内存释放函数
* compare 比较函数
*功能：循环链表初始化函数
*返回值：无
*作者：AlbertoNo1
*日期：2016-04-27
*/
void CList_Init(CList *clist, void (*destory)(void *data), int (*compare)(void *key1, void *key2))
{
clist->iSize = 0;
clist->destory = destory;
clist->compare = compare;
clist->pCListElmtHead = NULL;
}
/*
*函数名：CList_Insert_Next
*参数：clist 链表
* Lelment 待插入元素的前一个元素指针
* uiDataA 数据成员值
* puiDataB 数据成员值（动态申请内存）
*功能：循环链表插入元素函数
*返回值：0 成功 -1 失败
*作者：AlbertoNo1
*日期：2016-04-27
*/
int CList_Insert_Next(CList *clist, CListElmt *Lelement, unsigned int uiDataA, unsigned int *puiDataB)
{
CListElmt *pElment = NULL;
/*入参合法值由调用者保证*/
/*申请内存*/
pElment = (CListElmt*)malloc(sizeof(CListElmt));
if (NULL == pElment)
{
return -1;
}
/*数据域赋值*/
pElment->uiValueA = uiDataA;
pElment->puiValueB = puiDataB;
if (0 == CLIST_SIZE(clist))
{/*空链表插入元素*/
pElment->pNext = pElment;
/*更新链表头结点指针*/
clist->pCListElmtHead = pElment;
}
else
{
pElment->pNext = Lelement->pNext;
Lelement->pNext = pElment;
}
clist->iSize++;
return 0;
}
/*
*函数名：CList_Remove_Next
*参数：clist 链表
* Lelment 待删除元素的前一个元素指针
* puiDataA 返回数据成员值
* puiDataB 返回数据成员值（动态申请内存）
*功能：循环链表删除元素函数
*返回值：0 成功 -1 失败
*作者：AlbertoNo1
*日期：2016-04-27
*/
int CList_Remove_Next(CList *clist, CListElmt *Lelement, unsigned int *puiDataA, unsigned int **puiDataB)
{
CListElmt *pElment = NULL;
/*入参合法值由调用者保证*/
if (0 == CLIST_SIZE(clist))
{/*空链表删除元素*/
return -1;
}
pElment = Lelement->pNext;
/*数据域返回*/
*puiDataA = pElment->uiValueA;
*puiDataB = pElment->puiValueB;
if (Lelement->pNext == Lelement)
{/*删除最后一个元素*/
clist->pCListElmtHead = NULL;
}
else
{
Lelement->pNext = Lelement->pNext->pNext;
if (pElment == CLIST_HEAD(clist))
{
clist->pCListElmtHead = pElment->pNext;
}
}
/*释放链表结点内存*/
free(pElment);
clist->iSize--;
return 0;
}
/*
*函数名：CList_Destory
*参数：clist 链表
*功能：循环链表销毁函数
*返回值：无
*作者：AlbertoNo1
*日期：2016-04-27
*/
void CList_Destory(CList *clist)
{
unsigned int uiDataA = 0;
unsigned int *puiDataB = NULL;
while (CLIST_SIZE(clist) > 0)
{
if ((0 == CList_Remove_Next(clist, CLIST_HEAD(clist), &uiDataA, &puiDataB)) && (NULL != clist->destory))
{
clist->destory(puiDataB);
}
}
}
/*空链表插入*/
void test_func1(CList *clist)
{
int iRet = 0;
unsigned int uiDataA = 0;
unsigned int *puiDataB = NULL;
CListElmt *element = NULL;
/*测试*/
uiDataA = 11;
puiDataB = (unsigned int*)malloc(sizeof(unsigned int));
if (NULL == puiDataB)
{
return;
}
*puiDataB = 99;
iRet = CList_Insert_Next(clist, NULL, uiDataA, puiDataB);
if (-1 == iRet)
{
return;
}
printf("预期结果\n");
printf("数据：11 99 \n");
printf("链表大小：1 \n");
printf("\n实际结果\n");
printf("数据：");
for(element = CLIST_HEAD(clist); NULL != element; element = element->pNext)
{
printf("%u %u", element->uiValueA, *(element->puiValueB));
if (CLIST_HEAD(clist) == element->pNext)
{
break;
}
}
printf("\n链表大小：%d \n", CLIST_SIZE(clist));
}
/*非空链表插入*/
void test_func2(CList *clist)
{
int iRet = 0;
unsigned int uiDataA = 0;
unsigned int *puiDataB = NULL;
CListElmt *element = NULL;
/*测试*/
uiDataA = 12;
puiDataB = (unsigned int*)malloc(sizeof(unsigned int));
if (NULL == puiDataB)
{
return;
}
*puiDataB = 98;
iRet = CList_Insert_Next(clist, CLIST_HEAD(clist), uiDataA, puiDataB);
if (-1 == iRet)
{
return;
}
printf("预期结果\n");
printf("数据：11 99 12 98\n");
printf("链表大小：2 \n");
printf("\n实际结果\n");
printf("数据：");
for(element = CLIST_HEAD(clist); NULL != element; element = element->pNext)
{
printf("%u %u ", element->uiValueA, *(element->puiValueB));
if (CLIST_HEAD(clist) == element->pNext)
{
break;
}
}
printf("\n链表大小：%d \n", CLIST_SIZE(clist));
}
/*非空链表插入*/
void test_func3(CList *clist)
{
int iRet = 0;
unsigned int uiDataA = 0;
unsigned int *puiDataB = NULL;
CListElmt *element = NULL;
/*测试*/
uiDataA = 13;
puiDataB = (unsigned int*)malloc(sizeof(unsigned int));
if (NULL == puiDataB)
{
return;
}
*puiDataB = 97;
iRet = CList_Insert_Next(clist, CLIST_HEAD(clist), uiDataA, puiDataB);
if (-1 == iRet)
{
return;
}
printf("预期结果\n");
printf("数据：11 99 13 97 12 98\n");
printf("链表大小：3 \n");
printf("\n实际结果\n");
printf("数据：");
for(element = CLIST_HEAD(clist); NULL != element; element = element->pNext)
{
printf("%u %u ", element->uiValueA, *(element->puiValueB));
if (CLIST_HEAD(clist) == element->pNext)
{
break;
}
}
printf("\n链表大小：%d \n", CLIST_SIZE(clist));
}
int _tmain(int argc, _TCHAR* argv[])
{
int iRet = 0;
CList stCList = {0};
CListElmt *element = NULL;
/*链表初始化*/
CList_Init(&stCList, MemoryFree, DataCompare);
printf("\n\n");
test_func1(&stCList);
printf("\n\n");
test_func2(&stCList);
printf("\n\n");
test_func3(&stCList);
/*链表销毁*/
CList_Destory(&stCList);
printf("\n\n");
printf("iSize = %u Headaddr = %x", stCList.iSize, stCList.pCListElmtHead);
getchar();
return 0;
}
双向循环链表的实现
// CDList.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <malloc.h>
/*双向循环链表元素结构体定义*/
typedef struct CDListElmt_
{
unsigned int uiValueA; /*数据域 数据成员*/
unsigned int *puiValueB; /*数据域 数据成员，需要动态申请内存*/
struct CDListElmt_ *pNext; /*指针域 指向后一个元素结点的指针*/
struct CDListElmt_ *pPrev; /*指针域 指向前一个元素结点的指针*/
}CDListElmt;
/*循环链表结构体定义*/
typedef struct CDList_
{
int iSize; /*链表大小*/
void (*destory)(void *data); /*用于释放元素结点内动态申请的内存*/
int (*compare)(void *key1, void *key2); /*比较函数 返回值 0 相等 1 大于 -1 小于*/
CDListElmt *pCDListElmtHead; /*指向链表头结点的指针*/
/*循环链表无尾结点指针*/
}CDList;
/*循环链表操作宏定义*/
#define CDLIST_SIZE(cdlist) ((cdlist)->iSize)
#define CDLIST_HEAD(cdlist) ((cdlist)->pCDListElmtHead)
/*函数声明*/
void MemoryFree(void *data);
int DataCompare(void *key1, void *key2);
void CDList_Init(CDList *cdlist, void (*destory)(void *data), int (*compare)(void *key1, void *key2));
int CDList_Insert_Next(CDList *cdlist, CDListElmt *Lelement, unsigned int uiDataA, unsigned int *puiDataB);
int CDList_Insert_Prev(CDList *cdlist, CDListElmt *Lelement, unsigned int uiDataA, unsigned int *puiDataB);
int CDList_Remove(CDList *cdlist, CDListElmt *Lelement, unsigned int *puiDataA, unsigned int **puiDataB);
void CDList_Destory(CDList *cdlist);
/*
*函数名：MemoryFree
*参数：data 待释放的内存
*功能：释放动态申请的内存
*返回值：无
*作者：AlbertoNo1
*日期：2016-04-20
*/
void MemoryFree(void *data)
{
free(data);
}
/*
*函数名：DataCompare
*参数：key1 待比较的元素1
* key2 待比较的元素2
*功能：比较两个元素的大小（无符号整型）
*返回值：0 key1 等于 key2 1 key1 大于 key2 -1 key1 小于 key2
*作者：AlbertoNo1
*日期：2016-04-20
*/
int DataCompare(void *key1, void *key2)
{
unsigned int uiKey1 = 0;
unsigned int uiKey2 = 0;
uiKey1 = *((unsigned int*)key1);
uiKey2 = *((unsigned int*)key2);
if (uiKey1 < uiKey2)
{
return -1;
}
else if (uiKey1 > uiKey2)
{
return 1;
}
else
{
return 0;
}
}
/*
*函数名：CDList_Init
*参数：cdlist 待初始化的链表
* destory 数据域动态内存释放函数
* compare 比较函数
*功能：双向循环链表初始化函数
*返回值：无
*作者：AlbertoNo1
*日期：2016-04-27
*/
void CDList_Init(CDList *cdlist, void (*destory)(void *data), int (*compare)(void *key1, void *key2))
{
cdlist->iSize = 0;
cdlist->destory = destory;
cdlist->compare = compare;
cdlist->pCDListElmtHead = NULL;
}
/*
*函数名：CDList_Insert_Next
*参数：cdlist 链表
* Lelment 待插入元素的前一个元素指针
* uiDataA 数据成员值
* puiDataB 数据成员值（动态申请内存）
*功能：双向循环链表插入元素函数（指定元素之后）
*返回值：0 成功 -1 失败
*作者：AlbertoNo1
*日期：2016-04-27
*/
int CDList_Insert_Next(CDList *cdlist, CDListElmt *Lelement, unsigned int uiDataA, unsigned int *puiDataB)
{
CDListElmt *pElment = NULL;
/*入参合法值由调用者保证*/
/*申请内存*/
pElment = (CDListElmt*)malloc(sizeof(CDListElmt));
if (NULL == pElment)
{
return -1;
}
/*数据域赋值*/
pElment->uiValueA = uiDataA;
pElment->puiValueB = puiDataB;
if (0 == CDLIST_SIZE(cdlist))
{/*空链表插入元素*/
pElment->pNext = pElment;
pElment->pPrev = pElment;
/*更新链表头结点指针*/
cdlist->pCDListElmtHead = pElment;
}
else
{
pElment->pNext = Lelement->pNext;
pElment->pPrev = Lelement;
Lelement->pNext->pPrev = pElment;
Lelement->pNext = pElment;
}
cdlist->iSize++;
return 0;
}
/*
*函数名：CDList_Insert_Prev
*参数：cdlist 链表
* Lelment 待插入元素的前一个元素指针
* uiDataA 数据成员值
* puiDataB 数据成员值（动态申请内存）
*功能：双向循环链表插入元素函数（指定元素之前）
*返回值：0 成功 -1 失败
*作者：AlbertoNo1
*日期：2016-04-27
*/
int CDList_Insert_Prev(CDList *cdlist, CDListElmt *Lelement, unsigned int uiDataA, unsigned int *puiDataB)
{
CDListElmt *pElment = NULL;
/*入参合法值由调用者保证*/
/*申请内存*/
pElment = (CDListElmt*)malloc(sizeof(CDListElmt));
if (NULL == pElment)
{
return -1;
}
/*数据域赋值*/
pElment->uiValueA = uiDataA;
pElment->puiValueB = puiDataB;
if (0 == CDLIST_SIZE(cdlist))
{/*空链表插入元素*/
pElment->pNext = pElment;
pElment->pPrev = pElment;
/*更新链表头结点指针*/
cdlist->pCDListElmtHead = pElment;
}
else
{
pElment->pNext = Lelement;
pElment->pPrev = Lelement->pPrev;
Lelement->pPrev->pNext = pElment;
Lelement->pPrev = pElment;
}
cdlist->iSize++;
return 0;
}
/*
*函数名：CDList_Remove
*参数：cdlist 链表
* Lelment 待删除元素指针
* puiDataA 返回数据成员值
* puiDataB 返回数据成员值（动态申请内存）
*功能：双向循环链表删除元素函数
*返回值：0 成功 -1 失败
*作者：AlbertoNo1
*日期：2016-04-27
*/
int CDList_Remove(CDList *cdlist, CDListElmt *Lelement, unsigned int *puiDataA, unsigned int **puiDataB)
{
CDListElmt *pElment = NULL;
/*入参合法值由调用者保证*/
if (0 == CDLIST_SIZE(cdlist))
{/*空链表删除元素*/
return -1;
}
pElment = Lelement;
/*数据域返回*/
*puiDataA = pElment->uiValueA;
*puiDataB = pElment->puiValueB;
if (Lelement->pNext == Lelement)
{/*删除最后一个元素*/
cdlist->pCDListElmtHead = NULL;
}
else
{
Lelement->pPrev->pNext = Lelement->pNext;
Lelement->pNext->pPrev = Lelement->pPrev;
if (pElment == CDLIST_HEAD(cdlist))
{
cdlist->pCDListElmtHead = pElment->pNext;
}
}
/*释放链表结点内存*/
free(pElment);
cdlist->iSize--;
return 0;
}
/*
*函数名：CDList_Destory
*参数：cdlist 链表
*功能：双向循环链表销毁函数
*返回值：无
*作者：AlbertoNo1
*日期：2016-04-27
*/
void CDList_Destory(CDList *cdlist)
{
unsigned int uiDataA = 0;
unsigned int *puiDataB = NULL;
while (CDLIST_SIZE(cdlist) > 0)
{
if ((0 == CDList_Remove(cdlist, CDLIST_HEAD(cdlist), &uiDataA, &puiDataB)) && (NULL != cdlist->destory))
{
cdlist->destory(puiDataB);
}
}
}
/*空链表插入*/
void test_func1(CDList *cdlist)
{
int iRet = 0;
unsigned int uiDataA = 0;
unsigned int *puiDataB = NULL;
CDListElmt *element = NULL;
/*测试*/
uiDataA = 11;
puiDataB = (unsigned int*)malloc(sizeof(unsigned int));
if (NULL == puiDataB)
{
return;
}
*puiDataB = 99;
iRet = CDList_Insert_Next(cdlist, NULL, uiDataA, puiDataB);
if (-1 == iRet)
{
return;
}
printf("预期结果\n");
printf("数据：11 99 \n");
printf("链表大小：1 \n");
printf("\n实际结果1（顺序）\n");
printf("数据：");
for(element = CDLIST_HEAD(cdlist); NULL != element; element = element->pNext)
{
printf("%u %u ", element->uiValueA, *(element->puiValueB));
if (CDLIST_HEAD(cdlist) == element->pNext)
{
break;
}
}
printf("\n链表大小：%d \n", CDLIST_SIZE(cdlist));
printf("\n实际结果2（逆序）\n");
printf("数据：");
for(element = CDLIST_HEAD(cdlist); NULL != element; element = element->pPrev)
{
printf("%u %u ", element->uiValueA, *(element->puiValueB));
if (CDLIST_HEAD(cdlist) == element->pPrev)
{
break;
}
}
printf("\n链表大小：%d \n", CDLIST_SIZE(cdlist));
}
/*非空链表插入*/
void test_func2(CDList *cdlist)
{
int iRet = 0;
unsigned int uiDataA = 0;
unsigned int *puiDataB = NULL;
CDListElmt *element = NULL;
/*测试*/
uiDataA = 12;
puiDataB = (unsigned int*)malloc(sizeof(unsigned int));
if (NULL == puiDataB)
{
return;
}
*puiDataB = 98;
iRet = CDList_Insert_Next(cdlist, CDLIST_HEAD(cdlist), uiDataA, puiDataB);
if (-1 == iRet)
{
return;
}
printf("预期结果\n");
printf("数据：11 99 12 98\n");
printf("链表大小：2 \n");
printf("\n实际结果1(顺序)\n");
printf("数据：");
for(element = CDLIST_HEAD(cdlist); NULL != element; element = element->pNext)
{
printf("%u %u ", element->uiValueA, *(element->puiValueB));
if (CDLIST_HEAD(cdlist) == element->pNext)
{
break;
}
}
printf("\n链表大小：%d \n", CDLIST_SIZE(cdlist));
printf("\n实际结果2（逆序）\n");
printf("数据：");
for(element = CDLIST_HEAD(cdlist); NULL != element; element = element->pPrev)
{
printf("%u %u ", element->uiValueA, *(element->puiValueB));
if (CDLIST_HEAD(cdlist) == element->pPrev)
{
break;
}
}
printf("\n链表大小：%d \n", CDLIST_SIZE(cdlist));
}
/*非空链表插入*/
void test_func3(CDList *cdlist)
{
int iRet = 0;
unsigned int uiDataA = 0;
unsigned int *puiDataB = NULL;
CDListElmt *element = NULL;
/*测试*/
uiDataA = 13;
puiDataB = (unsigned int*)malloc(sizeof(unsigned int));
if (NULL == puiDataB)
{
return;
}
*puiDataB = 97;
iRet = CDList_Insert_Next(cdlist, CDLIST_HEAD(cdlist), uiDataA, puiDataB);
if (-1 == iRet)
{
return;
}
printf("预期结果\n");
printf("数据：11 99 13 97 12 98\n");
printf("链表大小：3 \n");
printf("\n实际结果1（顺序）\n");
printf("数据：");
for(element = CDLIST_HEAD(cdlist); NULL != element; element = element->pNext)
{
printf("%u %u ", element->uiValueA, *(element->puiValueB));
if (CDLIST_HEAD(cdlist) == element->pNext)
{
break;
}
}
printf("\n链表大小：%d \n", CDLIST_SIZE(cdlist));
printf("\n实际结果2（逆序）\n");
printf("数据：");
for(element = CDLIST_HEAD(cdlist); NULL != element; element = element->pPrev)
{
printf("%u %u ", element->uiValueA, *(element->puiValueB));
if (CDLIST_HEAD(cdlist) == element->pPrev)
{
break;
}
}
printf("\n链表大小：%d \n", CDLIST_SIZE(cdlist));
}
/*非空链表插入*/
void test_func4(CDList *cdlist)
{
int iRet = 0;
unsigned int uiDataA = 0;
unsigned int *puiDataB = NULL;
CDListElmt *element = NULL;
/*测试*/
uiDataA = 14;
puiDataB = (unsigned int*)malloc(sizeof(unsigned int));
if (NULL == puiDataB)
{
return;
}
*puiDataB = 96;
iRet = CDList_Insert_Prev(cdlist, CDLIST_HEAD(cdlist), uiDataA, puiDataB);
if (-1 == iRet)
{
return;
}
printf("预期结果\n");
printf("数据：11 99 13 97 12 98 14 96 \n");
printf("链表大小：4 \n");
printf("\n实际结果1（顺序）\n");
printf("数据：");
for(element = CDLIST_HEAD(cdlist); NULL != element; element = element->pNext)
{
printf("%u %u ", element->uiValueA, *(element->puiValueB));
if (CDLIST_HEAD(cdlist) == element->pNext)
{
break;
}
}
printf("\n链表大小：%d \n", CDLIST_SIZE(cdlist));
printf("\n实际结果2（逆序）\n");
printf("数据：");
for(element = CDLIST_HEAD(cdlist); NULL != element; element = element->pPrev)
{
printf("%u %u ", element->uiValueA, *(element->puiValueB));
if (CDLIST_HEAD(cdlist) == element->pPrev)
{
break;
}
}
printf("\n链表大小：%d \n", CDLIST_SIZE(cdlist));
}
int _tmain(int argc, _TCHAR* argv[])
{
int iRet = 0;
CDList stCDList = {0};
CDListElmt *element = NULL;
/*链表初始化*/
CDList_Init(&stCDList, MemoryFree, DataCompare);
printf("\n\n");
test_func1(&stCDList);
printf("\n\n");
test_func2(&stCDList);
printf("\n\n");
test_func3(&stCDList);
printf("\n\n");
test_func4(&stCDList);
/*链表销毁*/
CDList_Destory(&stCDList);
printf("\n\n");
printf("iSize = %u Headaddr = %x", stCDList.iSize, stCDList.pCDListElmtHead);
getchar();
return 0;
}