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Computing with Data

elgeish
33.3K views

Operator Overloading

#include <iostream>
using namespace std;
class Point {
private:
// fields are accessible only to methods belonging to point
double x;
double y;
public:
Point() {}
// constructor accepting two arguments, called by a
// statement such as: Point p(1, 2);
Point(double a_x, double a_y) : x(a_x), y(a_y) {}
// get value of x, const implies that the method does not
// modify the object
double get_x() const {
return x;
}
// get value of y, const implies that the method does not
// modify the object
double get_y() const {
return y;
}
// overload addition operator (+)
Point operator+(const Point &p) const {
Point result;
result.x = this->x + p.x;
result.y = this->y + p.y;
return result;
}
};
ostream& operator<<(ostream& os, const Point &p) {
os << '(' << p.get_x() << ',' << p.get_y() << ')';
return os; // to support operator chaining
}
int main() {
Point p1(1,2);
Point p2(2,3);
Point p3 = p1 + p2; // calls the overloaded + operator
// calls the overloaded << operator thrice for points
// and thrice for spaces and end-of-line delimiters
cout << p1 << ' ' << p2 << ' ' << p3 << endl;
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