C++重载++和<<

        常见的加减乘除等运算符相对比较好重载,++和<<相对麻烦一些。

1.重载++:

重载++如下:

class node {
protected:
    int32_t x = {0};
    int32_t y = {0};
public:
    //前置自增,即++i
    node operator++() {
        x++;
        y++;
        return *this;
    }
    //注意,后置自增的参数只能是int,无论是什么类型的自增
    node operator ++(int) {
        node node1 = *this;
        x++;
        y++;
        return node1;
    }
};

2.重载<<和>>:

        如下:

class node {
protected:
    int32_t x = {0};
    int32_t y = {0};
public:
    //设置成友元函数是为了访问私有和保护变量
    friend std::ostream& operator<<(std::ostream& out, const node& s) {
        out << "x:"<<s.x << "\n" << "y:" << s.y;
        return out;
    }
    friend std::istream& operator>>(std::istream& in, node& s) {
        in >> s.x >> s.y;
        return in;
    }
};

posted @ 2022-05-11 19:44  shldy1999  阅读(54)  评论(0)    收藏  举报