可以重載為成員函數,但是當我重載為友元函數時就出錯.. 不知道哪們大蝦幫忙解釋一下.
以下是出錯信息:  
   --------------------Configuration: 1 - Win32 Debug--------------------
Compiling...
1.cpp
E:\VC\VC6CN\COMMON\MSDEV98\BIN\1\1.cpp(10) : fatal error C1001: INTERNAL COMPILER ERROR
        (compiler file 'msc1.cpp', line 1786)
         Please choose the Technical Support command on the Visual C++
         Help menu, or open the Technical Support help file for more information
执行 cl.exe 时出错.

1.exe - 1 error(s), 0 warning(s)


以下是程序:
#include<iostream>
using namespace std;
class Vector1
{  
    int x,y;
public:
    Vector1() {  };
    Vector1(int x1,int y1) { x=x1; y=y1; }
    friend Vector1 operator +(Vector1 v1,Vector1 v2)  //提示這裡有錯..
    {  Vector1 tmp;
      tmp.x=v1.x+v2.x;
      tmp.y=v1.y+v2.y;
      return tmp;
    }
   void disp()
   { cout<<"("<<x<<","<<y<<")"<<endl;
   }
};

void main()
{  Vector1 v1(6,8),v2(3,6),v3;
   v3=v1+v2;
   cout<<"v1+v2=";
   v3.disp();
}