在C语言中引入类的概念

王朝c/c++·作者佚名  2008-06-01
窄屏简体版  字體: |||超大  

基于对象的程序设计的好处大家应该都有一定的体会,但是在 C 语言中并不支持类的概念,不过我们可以通过 strUCt 实现一些基础的类对象,如队列、堆栈等。通过对象的实现可以在一定程度上提高编程效率、简化 C程序设计。下面使用一个例子来介绍下如何在实现一个简单的类,希望对大家有些益处:

/* 应用消息队列类 */

struct AppQueue{

struct AppFrame *pHead, *pTail;

void (*InQueue)(struct AppQueue *papq, struct AppFrame *apf);

struct AppFrame * (*OutQueue)(struct AppQueue *papq);

unsigned char (*Empty)(struct AppQueue *papq);

void (*ClearQueue)(struct AppQueue *papq);

};

/* AppQueue 类成员函数实体 */

void apq_InQueue(struct AppQueue *papq, struct AppFrame *apf)

{

if(apf == NULL) return;

apf->pNext = NULL;

if(papq->pTail != NULL){

papq->pTail->pNext = apf;

papq->pTail = apf;

}

else{

papq->pHead = papq->pTail = apf;

}

}

struct AppFrame * apq_OutQueue(struct AppQueue *papq)

{

struct AppFrame *paf;

paf = papq->pHead;

if(papq->pHead != papq->pTail){

papq->pHead = papq->pNext;

}

else{

papq->pHead = papq->pTail = NULL;

}

return paf;

}

unsigned char apq_Empty(struct AppQueue *papq)

{

if((papq->pHead == papq->pTail) && (papq->pTail == NULL))

return TRUE;

else

return FALSE;

}

void apq_ClearQueue(struct AppQueue *papq)

{

struct AppFrame *paf;

while((paf = papq->OutQueue(papq)) != NULL){

SysAppPool.Free(&SysAppPool, paf);

}

}

/* AppQueue 类对象初始化 */

void InitAppQueue(struct AppQueue *papq)

{

papq->pHead = papq->pTail = NULL;

papq->InQueue = apq_InQueue;

papq->OutQueue = apq_OutQueue;

papq->Empty = apq_Empty;

papq->ClearQueue = apq_ClearQueue;

}

Qiyaismine@163.com

 
 
 
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