在C語言中引入類的概念
2019-11-17 05:15:41
供稿：網友
基于對象的程序設計的好處大家應該都有一定的體會，但是在 C 語言中并不支持類的概念，不過我們可以通過 strUCt 實現一些基礎的類對象，如隊列、堆棧等。通過對象的實現可以在一定程度上提高編程效率、簡化 C程序設計。下面使用一個例子來介紹下如何在實現一個簡單的類，希望對大家有些益處：
/* 應用消息隊列類 */
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 類成員函數實體 */
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 類對象初始化 */
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
