Study _抽象_甘肃龙网

目录
瓢
MAP
【Study】码一码
瓢
最近，看了下khala部分源码，对于c++的特性觉得甚是神奇，再次记录一笔，大致画了个瓢。

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MAP
如上，大致关系。
码一码

typedef std::function RegisterMessageCallBack;// 红黑树typedef QMap MsgHandleMap;// 哈希表,查找更高效//typedef std::unordered_map MsgHandleMap;// mapclass RegisterHandler{public:RegisterHandler(MsgHandleMap &msgHandlerMap);bool setRegisterMsg(QString &type, RegisterMessageCallBack const &cb);private:// CareMsgHandleMap &m_msgHandleMap;};// deltailclass GObject{public:GObject();virtual ~GObject();virtual void setRegisterMsg(RegisterHandler &handler) = 0;// 多态注册void setRegisterMap();MsgHandleMap getRegisterMap();private:MsgHandleMap m_msgHandleMap;};

RegisterHandler::RegisterHandler(MsgHandleMap &msgHandlerMap):m_msgHandleMap(msgHandlerMap){}bool RegisterHandler::setRegisterMsg(QString &type, const RegisterMessageCallBack &cb){m_msgHandleMap[type] = cb;return true;}GObject::GObject(){}GObject::~GObject(){}void GObject::setRegisterMap(){RegisterHandler handler(m_msgHandleMap);setRegisterMsg(handler);}MsgHandleMap GObject::getRegisterMap(){return m_msgHandleMap;}

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如上，这个map存于抽象类，并有维护这个map，node:中这个map的引用

class ObjManager{public:ObjManager();void addObjMap(QString const &type, GObject *obj);void findAndUse(QVariantMap const &map);private:typedef QMap ObjectMap;ObjectMap m_objMap;};

void ObjManager::addObjMap(const QString &type, GObject *obj){m_objMap[type] = obj;// 新增对象方法的注册obj->setRegisterMap();}void ObjManager::findAndUse(QVariantMap const &map){auto it = m_objMap.find(map[OBJECT_TYPE].toString());if(it != m_objMap.end()){// why can turn TempObjif(auto obj = static_cast(it.value())){MsgHandleMap funMap = obj->getRegisterMap();qDebug() << "have fun num:: " << funMap.count();int arg = 10;QString str = "hello";for(QMap::iterator it = funMap.begin(); it != funMap.end(); it++){it.value()(arg, str, 100);}}}}

如上，这个管理者其实对管理一个map，维护对象。

// 继承 Gobjvoid CusObject::setRegisterMsg(RegisterHandler &handler){// 注册自己新增事件handler.setRegisterMsg(MSG_CREATE,std::bind(&CusObject::onCreateMsg,this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));handler.setRegisterMsg(MSG_DESTORY, std::bind(&CusObject::onDestoryMsg, this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));}bool CusObject::onCreateMsg(int &n, QString &s, int nex){USE_HELP_FUNreturn true;}bool CusObject::onDestoryMsg(int &n, QString &s, int nex){USE_HELP_FUNreturn true;}// 继承 CusObjvoid SpeObject::setRegisterMsg(RegisterHandler &handler){// 显示调用父类注册,则继承者拥有父类的原来注册的事件CusObject::setRegisterMsg(handler);handler.setRegisterMsg(MSG_SPETEST, std::bind(&SpeObject::onSpeTestMsg, this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));}bool SpeObject::onSpeTestMsg(int &n, QString &s, int nex){USE_HELP_FUNreturn true;}

如上，子类通过显示调用父类，即可拥有父类的所有已注册函数，完美。
主要，这样的代码结构设计层次性和拓展型很强，值得借鉴。