Question

为什么编译有错误，一个重载函数为友元函数时。显示类中声明为友元函数那编译错误

#include<iostream>
using namespace std;
class Complex
{
public:
Complex(double r,double i):real(r),imag(i){}
friend Complex operator + (Complex &,Complex &);
private:
double real;
double imag;
};
Complex operator + (Complex &c1,Complex &c2)
{
return Complex(c1.real+c2.real,c1.imag+c2.imag);
}
int main()
{
return 0;
}

Answer 1

VC6不支持友元操作符重载