circle.h

#pragma once
 
#include "software/geom/convex_shape.h"
#include "software/geom/point.h"
 
class Circle final : public ConvexShape
{
   public:
    explicit Circle();
 
    explicit Circle(const Point &origin, double radius);
 
    const Point &origin() const;
 
    double radius() const;
 
    double area() const override;
 
   private:
    Point origin_;
    double radius_;
};
 
bool operator==(const Circle &c, const Circle &d);
 
bool operator!=(const Circle &c, const Circle &d);
 
std::ostream &operator<<(std::ostream &os, const Circle &circle);
 
template <>
struct std::hash<Circle>
{
    size_t operator()(const Circle &circle) const
    {
        return std::hash<Point>()(circle.origin()) ^ std::hash<double>()(circle.radius());
    }
};