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;
}
};