C ++ std :: stringstream运算符<<超载 [英] C++ std::stringstream operator<< overloading

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我有以下课程(原型):

I have the following class(prototipe):

class Token
{
public:
    //members, etc.
    friend std::stringstream& operator<< (std::stringstream &out, Token &t);
};

操作符的实现是这样的:

And the operator is implemented like this:

std::stringstream & operator<< (std::stringstream &out, Token &t)
{
    out << t.getValue(); //class public method
    return out;
}

现在，我正在尝试像这样使用它:

Now, I'm trying to use it like this:

std::stringstream out;
Token t;
//initialization, etc.

out << t;

VS给我一个错误，说<<不匹配.操作员.我怎么了?

And VS gives me error, saying that there is no match for << operator. What am I wrong in?

std::stringstream & operator<< (std::stringstream &out, Token &t)

应该是

std::ostream & operator<< (std::ostream &out, Token const &t)

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C ++ std :: stringstream运算符&lt;&lt;超载 [英] C++ std::stringstream operator&lt;&lt; overloading