dynamic_cast 例子

#pragma once
#include <string>
using namespace std;

class  NCEventArg{
public:
	enum MSGType{CENTRAL_WIN_CHANGE, ALARM, TOOL_CHANGE,  \
		KEYBOARD, MARGIN_WIN_CHANGE, GENERAL, CLOSE, RESTART};
protected:
	MSGType _EventType;

public:
	NCEventArg(void){};
	virtual ~NCEventArg(void){};
	MSGType GetEventType() const {return _EventType;}

};

class CenteralWinChangeEventArg : public NCEventArg{
public:
	CenteralWinChangeEventArg(void){ _EventType = CENTRAL_WIN_CHANGE;}
	~CenteralWinChangeEventArg(void){}

	void SetEvent(string str){_eventMsg = str;}
	string GetEvent(){return _eventMsg;}

private:
	string _eventMsg;
};

class Alarm : public NCEventArg{
public:
	Alarm(void){ _EventType = ALARM;}
	~Alarm(void){}

	void SetEvent(string str){_eventMsg = str;}
	string GetEvent(){return _eventMsg;}

private:
	string _eventMsg;
};

class ToolChange : public NCEventArg{
public:
	ToolChange(void){ _EventType = TOOL_CHANGE;}
	~ToolChange(void){}

	void SetEvent(string str){_eventMsg = str;}
	string GetEvent(){return _eventMsg;}

private:
	string _eventMsg;
};

class MarginWinChange : public NCEventArg{
public:
	MarginWinChange(void){ _EventType = MARGIN_WIN_CHANGE;}
	~MarginWinChange(void){}

	void SetEvent(string str){_eventMsg = str;}
	string GetEvent(){return _eventMsg;}

private:
	string _eventMsg;
};

void test(NCEventArg &e)
{
	if(CenteralWinChangeEventArg *centerEvent =  dynamic_cast<CenteralWinChangeEventArg*>(&e))
	{
		cout << "CenteralWinChange" << endl;
		cout << centerEvent->GetEvent() << endl;
	}

	else if(Alarm *centerEvent =  dynamic_cast<Alarm*>(&e))
	{
		cout << "Alarm"<< endl;
		cout << centerEvent->GetEvent() << endl;
	}
	else if(ToolChange* toolChange = dynamic_cast<ToolChange*>(&e))
	{
		cout << "Tool change"<< endl;
		cout << toolChange->GetEvent() << endl;
	}
	else if(MarginWinChange* marginWinChange = dynamic_cast<MarginWinChange*>(&e))
	{
		cout << "MarginWinChange"<< endl;
		cout << centerEvent->GetEvent() << endl;
	}

}

int main(void)
{
	Alarm e;
	e.SetEvent("AlarmEvent");
	test(e);

	CenteralWinChangeEventArg e1;
	e1.SetEvent("centerEvent");
	test(e1);

	ToolChange e2;
	e2.SetEvent("ToolChangeEvent");
	test(e2);
}