Method ForEachSide

libs/geometry/rect2d.hpp:134–140

  template <typename Fn>
  void ForEachSide(Fn && fn) const
  {
    fn(LeftTop(), LeftBottom());
    fn(LeftBottom(), RightBottom());
    fn(RightBottom(), RightTop());
    fn(RightTop(), LeftTop());
  }

  bool IsIntersect(Rect const & r) const
  {