小编Mar*_*ark的帖子

我有一个C++类,它具有以下接口:

class F {
public:
    F(int n, int d);
    // no other constructors/assignment constructors defined
    F& operator *= (const F&);
    F& operator *= (int);
    int n() const;
    int d() const;
};

我有以下代码:

const F a{3, 7};
const F b{5, 10};
auto result = F{a} *= b; // How does this compile?

在Visual Studio(VS)2013下,注释行编译时没有错误.在VS2015下,产生错误C2678:

error C2678: binary '*=': no operator found 
    which takes a left-hand operand of type 'const F' 
    (or there is no acceptable conversion)
note: could be 'F &F::operator …