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  1. #include <vector>
  2. #include <unordered_map>
  3.  
  4. template <typename K, typename... TArgs, template<typename...> class TContainer>
  5. std::vector<K> getKeys(const TContainer<K, TArgs...>& mMap)
  6. {
  7.     std::vector<K> result;
  8.     for (auto p : mMap)
  9.         result.push_back(p.first);
  10.     return result;
  11. }
  12.  
  13. template <typename Container>
  14. auto getKeys2(const Container& mMap) -> std::vector<typename Container::key_type>
  15. {
  16.     std::vector<typename Container::key_type> result;
  17.     for (auto p : mMap)
  18.         result.push_back(p.first);
  19.     return result;
  20. }
  21.  
  22. int main()
  23. {
  24.     std::unordered_map<int, int> m;
  25.     m[1] = 4;
  26.     m[2] = 7;
  27.     std::vector<int> keys = getKeys(m);
  28.     std::vector<int> keys2 = getKeys2(m);
  29. }
Success #stdin #stdout 0s 3472KB
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https://ideone.com/PCkcu6
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
secret

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