constoverload.h

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#ifndef CONSTOVERLOAD_H
#define CONSTOVERLOAD_H

#include <iostream>

class Point3 {   /* 3-dimension point (of double) */
 public:
    friend std::ostream& operator<<(std::ostream& out, const Point3& v);
    Point3(double x = 0, double y = 0, double z = 0);
    double& operator[](int index);    
    const double& operator[](int index) const; /* overloaded
       on const-ness */
    Point3 operator+(const Point3& v) const;
    Point3 operator-(const Point3& v) const;
    Point3 operator*(double s) const;   /* scalar multiplication */
 private:
    static const int cm_Dim = 3;
    double m_Coord[cm_Dim];
};

#endif