C++同时重载减号运算符和负号运算符的问题
请看下面一段程序:
#include <iostream>
using namespace std;
class complex
{
public:
complex(int re = 0, int im = 0)
{
real = re;
image = im;
}
complex operator -() //重载负号
{
return complex(-real, -image);
}
friend complex operator -(const complex &c1, const complex &c2) //重载减号
{
return complex(c1.real-c2.real, c1.image-c2.image);
}
friend ostream &operator <<(ostream &os, const complex &c)
{
os << "(" << c.real << ", " << c.image << ")";
return os;
}
private:
int real;
int image;
};
int main(int argc, char *argv[])
{
complex c(2, 5);
cout << c << endl;
cout << -c << endl;
}
上面的代码里重载负号或重载减号任意一种单独使用都是没问题的,但是当两者同时存在是,使用-c在vc6中编译就通不过了,不知道为啥?