// Implementation of Point members, most interesting operator< at the bottom of the file. #include #include #include "point.h" Point::Point(double x_coord, double y_coord): x(x_coord), y(y_coord){ } Point::Point(): x(0.0), y(0.0){ } double Point::getx () const{ return x; } double Point::gety () const{ return y; } void Point::move(double dx, double dy){ x += dx; y += dy; } double Point::distance_to(Point p){ return sqrt((x - p.x) * (x - p.x) + (y - p.y) * (y - p.y)); } std::ostream& operator<<(std::ostream& s, const Point& p){ return s << "(" << p.getx() << "," << p.gety() << ")" ; } // Implementation of comparisons that only take the x-coordinate into account. bool operator<(const Point& p1, const Point& p2){ return (p1.x < p2.x); }