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  1. #include <string>
  2. #include <iostream>
  3. #include <vector>
  4. #include <map>
  5. #include <unordered_map>
  6. using namespace std;
  7.  
  8. template<template <typename...> class MAP, class KEY, class VALUE>
  9. std::vector<KEY>
  10. keys(const MAP<KEY, VALUE>& map)
  11. {
  12. 	std::vector<KEY> result;
  13. 	result.reserve(map.size());
  14. 	for(const auto& it : map){
  15. 		result.emplace_back(it.first);
  16. 	}
  17. 	return result;
  18. }
  19.  
  20. template<template <typename...> class MAP, class KEY, class VALUE>
  21. std::vector<VALUE>
  22. values(const MAP<KEY, VALUE>& map)
  23. {
  24. 	std::vector<VALUE> result;
  25. 	result.reserve(map.size());
  26. 	for(const auto& it : map){
  27. 		result.emplace_back(it.second);
  28. 	}
  29. 	return result;
  30. }
  31.  
  32. int main() {
  33. 	std::map<std::string, int> string_to_int;
  34. 	// std::unordered_map<std::string, int> string_to_int;
  35. 	string_to_int.emplace("foo", 12);
  36. 	string_to_int.emplace("bar", 34);
  37.  
  38. 	cout << "Keys:" << endl;
  39. 	for(const auto& k : keys(string_to_int)){
  40. 		cout << k << endl;
  41. 	}
  42.  
  43. 	cout << "Values:" << endl;
  44. 	for(const auto& v : values(string_to_int)){
  45. 		cout << v << endl;
  46. 	}
  47.  
  48. 	return 0;
  49. }
Success #stdin #stdout 0s 3460KB
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stdin
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Standard input is empty
stdout
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Keys:
bar
foo
Values:
34
12
https://ideone.com/lYBzpL
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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