for 循环后面多了个分号引发的灾难

最新推荐文章于 2024-06-10 16:02:54 发布

boshuzhang

最新推荐文章于 2024-06-10 16:02:54 发布

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博客给出了聊天消息结构体ChatMsg和关系类Relation的代码实现。ChatMsg包含聊天内容、发起方ID等信息，Relation管理聊天消息集合。主函数创建Relation对象，统计未读消息数量，最后进入无限循环。

struct ChatMsg
{
   ChatMsg()
   {
       memset(pstrChat, 0, sizeof(pstrChat));
       fromUserId = 0;
       specialFlag = 0;
       timestamp = 0;
   }
   char pstrChat[256];
   DWORD fromUserId;           // 发起方
   BYTE specialFlag;
   DWORD timestamp;
   DWORD status; //大于0已读小于等于0未读
};

class Relation
{
public:
   Relation()
   {
       id = 0;
       chatMsgs.clear();
   }
   ~Relation()
   {
       std::vector<ChatMsg*>::iterator iter = chatMsgs.begin();
       for (; iter != chatMsgs.end(); )
       {
           iter = chatMsgs.erase(iter);
       }
   }
   QWORD id;
   std::vector<ChatMsg*> chatMsgs;
};
int main()
{
   Relation* relation = new Relation();
   if (relation->chatMsgs.size() <= 0)
   {
       //return 0;
       std::cout << relation->chatMsgs.size()<<std::endl;
   }

   DWORD chatNum = 0;
   std::vector<ChatMsg*>::iterator chatIter = relation->chatMsgs.begin();
   for (; chatIter != relation->chatMsgs.end(); chatIter++)
   {
       ChatMsg* pMsg = *chatIter;
       if (pMsg && pMsg->status <= 0)
       {
           ++chatNum;
       }
   }

while (1);
return 0;
}