C++ primer 13.4消息处理
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class CFolder;class CMessage{public:CMessage(const string &strMsg = "");~CMessage();CMessage(const CMessage &);CMessage & operator=(const CMessage &rhs);void Save(CFolder &);void Remove(CFolder &);private:void Put_Msg_In_Folders(const set<CFolder*> &);void Remove_Msg_From_Folders(); // 将自身从所有的CFolder集合中删除private:string m_strMsg;set<CFolder*> m_setFolder;};class CFolder{public:void AddMsg(CMessage *pMsg);void RemMsg(CMessage *pMsg);private:set<CMessage*> m_setMessage;};inline void TestMsg(){CFolder f1;CFolder f2;CFolder f3;CMessage msg1("hello");msg1.Save(f1);msg1.Save(f2);msg1.Save(f3);CMessage msg2 = msg1; // 复制构造函数CMessage msg3;msg3 = msg2; // 赋值操作符}
CMessage::CMessage(const string &strMsg /* = "" */):m_strMsg(strMsg){}CMessage::~CMessage(){Remove_Msg_From_Folders();}CMessage::CMessage(const CMessage &rhs):m_strMsg(rhs.m_strMsg) ,m_setFolder(rhs.m_setFolder){Put_Msg_In_Folders(m_setFolder);}CMessage & CMessage::operator=(const CMessage &rhs){if(this != &rhs){Remove_Msg_From_Folders();m_strMsg = rhs.m_strMsg;m_setFolder = rhs.m_setFolder;Put_Msg_In_Folders(rhs.m_setFolder);}return *this;}void CMessage::Put_Msg_In_Folders(const set<CFolder*> &setFolder){ set<CFolder*>::const_iterator itor = setFolder.begin();while(itor != setFolder.end()){(*itor)->AddMsg(this);++itor;}}void CMessage::Remove_Msg_From_Folders(){set<CFolder*>::const_iterator itor = m_setFolder.begin();while(itor != m_setFolder.end()){(*itor)->RemMsg(this);++itor;}}void CMessage::Save(CFolder &rf){m_setFolder.insert(&rf);}void CFolder::AddMsg(CMessage *pMsg){m_setMessage.insert(pMsg);}void CFolder::RemMsg(CMessage *pMsg){set<CMessage*>::iterator itor = m_setMessage.find(pMsg);if(itor != m_setMessage.end()){m_setMessage.erase(itor);}}
