重载运算符是否<<在班级内部工作吗?

问题描述

我的意思是，我试图使运算符超载<<在班级内部

I mean, I was trying to overload the operator<< inside the class

像这样

 class A {
      public:
           ostream &operator<<(ostream &os);// which doesnt work

      private:
           friend ostream &operator<<(ostream &os, const A& a); //Works
           int i;

 };

  Definition
          ostream &operator<<(ostream &os, const A& a) {
              os<<a.i;
              return os;
          }

为什么不能在特定于类的类内重载运算符?还是我错过了什么?还是我愚蠢地以这种方式思考?请告知.

why can't I overload the operator inside the class specific to class? or Am I missing something? or Am I stupid to even think in such a way? Please advise.

推荐答案

成员函数:

ostream &operator<<(ostream &os);

有用，但不适用于您想要的情况.当您执行以下操作时，它将被调用:

does work, but not for the situation you want. It will be called when you do something like:

A a;
a << std::cout;

即该对象是运算符的左侧.

i.e. where the object is the left-hand side of the operator.

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