C++重载自增运算符(很容易搞混)

#include <iostream.h>

class CPoint

{

private:

int x,y;

public:

CPoint(int xx=0, int yy=0)

{

x = xx;

y = yy;

}

void disp()

{

cout<<"("<<x<<','<<y<<")"<<endl;

}

CPoint operator + (CPoint q)

{

return CPoint(x+q.x,y+q.y);

}

CPoint operator - (CPoint q)

{

return CPoint(x-q.x,y-q.y);

}

CPoint operator ++()  //++CPoint

{

x++;

y++;

cout<<"++() called"<<endl;

return *this;

}

CPoint operator ++(int) //CPoint++

{

CPoint t(x,y);

x++;

y++;

cout<<"++(int) called"<<endl;

return t;

}

};

void main() 

{

CPoint a(10,10), b;

a.disp();

b = a++; // call ++(int)

a.disp();

b.disp();

b = ++a; // call ++()

a.disp();

b.disp();

}