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  1. #include <iostream>
  2. #include <memory>
  3. #include <tuple>
  4. #include <map>
  5.  
  6. struct Position { int x, y; };
  7. bool operator<(Position const &a, Position const &b)
  8. {
  9. 	return std::tie(a.x, a.y) < std::tie(b.x, b.y);
  10. }
  11. std::ostream &operator<<(std::ostream &os, Position const &p)
  12. {
  13. 	return os << '(' << p.x << ", " << p.y << ')';
  14. }
  15.  
  16. struct Board
  17. {
  18. 	class Piece
  19. 	{
  20. 		Position p;
  21. 		friend struct ::Board;
  22. 	public:
  23. 		Position const &pos = p;
  24. 		Piece(Position const &p)
  25. 		: p(p)
  26. 		{
  27. 		}
  28. 	};
  29.  
  30. 	void swap(Position const &source, Position const &target)
  31. 	{
  32. 		std::cout << "Swapping " << source << " to " << target << std::endl;
  33. 		pieces[target].swap(pieces[source]);
  34. 		pieces[target]->p = target;
  35. 		pieces[source]->p = source;
  36. 		std::cout << "Swapped  " << source << " to " << target << std::endl;
  37. 	}
  38.  
  39. 	void add(Position const &p)
  40. 	{
  41. 		pieces[p] = std::unique_ptr<Piece>(new Piece(p));
  42. 	}
  43. 	Piece *at(Position const &p)
  44. 	{
  45. 		return pieces[p].get();
  46. 	}
  47.  
  48. private:
  49. 	std::map<Position, std::unique_ptr<Piece>> pieces;
  50. };
  51.  
  52. int main()
  53. {
  54. 	Board b;
  55. 	b.add({1, 1});
  56. 	b.add({1, 2});
  57. 	b.add({2, 1});
  58. 	b.add({2, 2});
  59.  
  60. 	std::cout << "First swap:" << std::endl;
  61. 	b.swap({1, 1}, {1, 2});
  62. 	std::cout << std::endl
  63. 	          << "Second swap:" << std::endl;
  64. 	b.swap(b.at({2, 1})->pos, {2, 2});
  65. }
  66.  
Success #stdin #stdout 0s 3432KB
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stdin
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Standard input is empty
stdout
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First swap:
Swapping (1, 1) to (1, 2)
Swapped  (1, 1) to (1, 2)

Second swap:
Swapping (2, 1) to (2, 2)
Swapped  (2, 2) to (2, 2)
https://ideone.com/xwuawG
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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