如何制作与指针一起使用的重载运算符

问题描述

在主题中，我需要使用指针的运算符，因此我不必调用 *a>*b 而是 a>b.例如我的操作符 << 与指针一起工作:

As in the subject I need operator which will work with pointers so I do not have to call *a>*b but a>b.For example my operator << works with the pointers ok:

friend ostream& operator<< (ostream &wyjscie, Para const* ex){
    wyjscie << "(" << ex->wrt << ", " << ex->liczbaWystapien <<")"<< endl;
    return wyjscie;
}

但是这个给了我一个错误:

but this one give me an error:

friend bool operator> (Para const *p1, Para const *p2){
        return p1->wrt > p2->wrt;
}

Error   1   error C2803: 'operator >' must have at least one formal parameter of class type

推荐答案

你的重载 <<之所以有效，是因为它是在 ostream 对象上调用的 (ostream.operator<<()).

Your overloaded << works because it is being called on an ostream object (ostream.operator<<()).

运算符

The pointer overload of operator < does not work because a pointer is not a class so the following is meaningless: (const Para*).operator<().

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