/*! Return `true` if car `c` is parking in slot `this`. */
bool parked(BicycleCar const& c) const;
+ /*! Return `true` if `c`'s car frame collide with `this` border. */
+ bool collide(BicycleCar const& c) const;
+
friend std::ostream& operator<<(std::ostream& o, ParkingSlot const& s);
};