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  1. #include <iostream>
  2. #include <set>
  3.  
  4. struct Point
  5. {
  6. 	Point(double x, double y)
  7. 	: x(x)
  8. 	, y(y)
  9. 	{
  10.  
  11. 	}
  12.  
  13. 	friend bool operator < (const Point& lhs, const Point& rhs);
  14. 	friend bool operator == (const Point& lhs, const Point& rhs);
  15.  
  16. 	double x;
  17. 	double y;
  18. };
  19.  
  20. bool operator < (const Point& lhs, const Point& rhs)
  21. {
  22. 	return lhs.x < rhs.x;
  23. }
  24.  
  25. bool operator == (const Point& lhs, const Point& rhs)
  26. {
  27. 	return lhs.x == rhs.x && lhs.y == rhs.y;
  28. }
  29.  
  30. int main() 
  31. {
  32. 	std::set<Point> points = { Point(42.0, 50.0), Point(1.0, 2.0), Point(42.0, 50.0) };
  33.  
  34. 	for (const auto& p : points)
  35. 	{
  36. 		std::cout << p.x << ", " << p.y << std::endl;	
  37. 	}
  38.  
  39. 	return 0;
  40. }
Success #stdin #stdout 0s 3416KB
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Standard input is empty
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1, 2
42, 50
https://ideone.com/NQIVqY
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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