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  1. #include <iostream>
  2. #include <vector>
  3. #include <map>
  4.  
  5. namespace extract
  6. {
  7.     template <typename T1, typename T2>
  8.     const T2& e(const std::pair<T1, T2>& r)
  9.     {
  10.         return r.second;
  11.     }
  12.  
  13.     template <typename T>
  14.     const T& e(const T& r)
  15.     {
  16.         return r;
  17.     }
  18.  
  19.     template <typename IT>
  20.     auto e_it(IT&& it) -> decltype (e(*it))
  21.     {
  22.         return e(*it);
  23.     }
  24.  
  25. }
  26.  
  27. template<typename Iterator>
  28. void print(Iterator begin, Iterator end)
  29. {
  30.     while (begin != end)
  31.     {
  32.         std::cout << extract::e_it(begin) << std::endl;
  33.         ++begin;
  34.     }
  35. }
  36.  
  37. int main()
  38. {
  39.     std::vector<int> v(3, 1);
  40.     std::map<int, int> m = {{0, 10}, {1, 11}, {2, 12}};
  41.  
  42.     print(v.begin(), v.end());
  43.     print(m.begin(), m.end());
  44.  
  45.     return 0;
  46. }
  47.  
Success #stdin #stdout 0s 3476KB
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Standard input is empty
stdout
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1
1
1
10
11
12
https://ideone.com/hxGEPV
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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