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  1. #include <unordered_map>
  2. #include <string>
  3. #include <tuple>
  4. #include <functional>
  5. #include <cstddef>
  6. #include <iostream>
  7.  
  8. struct myStruct
  9. {
  10. 	int x;
  11. 	int y;
  12. };
  13. using Key = std::pair<std::string, std::string>;
  14. namespace something
  15. {
  16. 	struct Compare
  17. 	{
  18. 		std::size_t operator()(const Key& string_pair) const
  19. 		{
  20. 		    // just to demonstrate the comparison.
  21. 			return std::hash<std::string>{}(string_pair.first) ^
  22.                     std::hash<std::string>{}(string_pair.second);
  23. 		}
  24. 	};
  25. }
  26. using myMap = std::unordered_map<Key, myStruct, something::Compare>;
  27.  
  28. int main()
  29. {
  30. 	myMap mp =
  31. 	{
  32. 		{ { "name1", "name2" },{ 3,4 } },
  33. 		{ { "aame1", "name2" },{ 8,4 } },
  34. 		{ std::make_pair("fame1", "name2"),{ 2,4 } }, // or make pair
  35. 		{ std::make_pair("fame1", "bame2"),{ 1,2 } }
  36. 	};
  37.  
  38. 	for(const auto& it: mp)
  39.     {
  40.         std::cout << it.first.first << " " << it.first.second << " "
  41.                  << it.second.x << " " << it.second.y << std::endl;
  42.     }
  43.  
  44. 	return 0;
  45. }
Success #stdin #stdout 0s 4240KB
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stdin
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Standard input is empty
stdout
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fame1 name2 2 4
aame1 name2 8 4
fame1 bame2 1 2
name1 name2 3 4
https://ideone.com/w0gpEJ
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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