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  1. #include <unordered_set>
  2.  
  3. class Point
  4. {
  5.     public:
  6. 		struct Hash
  7. 		{
  8. 			size_t operator()(Point const & x) const noexcept
  9. 			{
  10. 				return (
  11. 					(51 + std::hash<int>()(x.getX())) * 51 +
  12. 					std::hash<int>()(x.getY())
  13. 				);
  14. 			}
  15. 		};
  16.  
  17. 		Point(int x, int y) : x_(x), y_(y) {}
  18.  
  19. 		int getX() const { return x_; }
  20. 		int getY() const { return y_; }
  21.  
  22. 		bool operator==(Point const & rhs) const 
  23. 		{
  24. 			return x_ == rhs.getX() &&
  25. 				y_ == rhs.getY();
  26. 		}
  27.  
  28. 		bool operator!=(Point const & rhs) const { return !(*this == rhs); }
  29.  
  30. 	private:
  31. 		int x_, y_;
  32. };
  33.  
  34. typedef std::unordered_set<Point, Point::Hash> PointSet;
  35.  
  36. int main()
  37. {
  38. 	PointSet x;
  39. 	x.insert(Point(1,2));
  40. 	return 0;
  41. }
Success #stdin #stdout 0s 3468KB
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https://ideone.com/Zd57Cn
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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