賦值運算子多載

// AssignmentOperatorTest.cpp : 定義控制台應用程式的進入點。//
#include "stdafx.h"#include <iostream>#include <typeinfo>
using namespace std;
class point{public:point(float x=0.0,float y=0.0){}inline virtual point& operator =(const point &p);protected:float _x,_y;};
inline point& point::operator =(const point &p){cout<<"i am point"<<endl;_x=p._x;//protected_y=p._y;return *this;}
class point3d:public point{public:inline virtual point3d& operator =(const point3d &p){cout<<"i am point3d"<<endl;return *this;}};


int _tmain(int argc, _TCHAR* argv[]){point3d pt3;
point &pp=pt3;
pp.operator =(pt3);
cout<<typeid(pp).name()<<endl;
getchar();
return 0;}