我试图用这样的非朋友非成员函数重载逗号运算符：
#include <iostream>
using std::cout;
using std::endl;
class comma_op
{
int val;
public:
void operator,(const float &rhs)
{
cout << this->val << "," << rhs << endl;
}
};
void operator,(const float &lhs,const comma_op &rhs)
{
cout << "Reached!\n"; // this gets printed though
rhs,lhs; // reversing this leads to a infinite recursion ;)
}
int main()
{
comma_op obj;
12.5f,obj;
return 0;
}
基本上,我试图让浮点数从两边使用逗号运算符.拥有成员函数只允许我编写obj,float_val,而有一个额外的帮助非朋友非成员函数允许我编写float_val,obj;但是不会调用成员操作符函数.
GCC哭泣：
comma.cpp: In function ‘void operator,(const float&,const comma_op&)’: comma.cpp:19: warning: left-hand operand of comma has no effect comma.cpp:19: warning: right-hand operand of comma has no effect
注意：
我意识到重载运算符,这也会使逗号超载,令人困惑,从纯粹主义者的角度来看也是不可取的.我只是在这里学习C语言的细微差别.
