9.2 입출력 연산자 오버로딩 하기

#include <iostream>
using namespace std;

class Point
{
private:
    double m_x, m_y, m_z;
    
public:
    Point(double x = 0.0, double y = 0.0, double z = 0.0)
        : m_x(x), m_y(y), m_z(z)
    {}
    
    double getX() { return m_x; }
    double getY() { return m_y; }
    double getZ() { return m_z; }
    
    //void print()
    //{
    //    cout << m_x << " " << m_y << " " << m_z << "\n";
    //}
    frined std::ostream& operator << (std::ostream &out, const Point &point)
    {
        out << point.m_x << " " << point.m_y << " " << point.m_z;
        
        return out; // chaining 하기 위해서 return out
    }
    
    frined std::istream& operator << (std::istream &in, Point &point)
    {
        in >> point.m_x >> " " >> point.m_y >> " " >> point.m_z;
        
        return in; // chaining 하기 위해서 return out
    }
    
    
};

int main()
{
    // Point p1(0.0, 0.1, 0.2), p2(3.4, 1.5, 2.0);
    
    //p1.print();
    //cout << " ";
    //p2.print();
    //cout << "\n"; 이렇게 말고 cout << p1 << " " << p2 << "\n"; 이런식으로 쓰고 싶다!
    Point p1,p2;
    
    cin >> p1 >> p2;
    
    cout << p1 << " " << p2 << "\n"; // file stream 할 때도 그대로 적용 가능해서 편리하다.
    
    
    
    
    
    
    return 0;
}