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  1. #include <vector>
  2. #include <set>
  3. #include <iostream>
  4.  
  5. using namespace std;
  6.  
  7. class Container
  8. {
  9. public:
  10.     Container() {}
  11.     Container(int _i) : i(_i) {}
  12.  
  13.     int get_i() const {return i;}
  14.  
  15.     int i;
  16. };
  17.  
  18.     template <
  19.         class U, 
  20.         class V, 
  21.         template <typename...> class T1,
  22.         template <typename...> class T2
  23.     >
  24.  
  25.     T2<V> WugMap(
  26.         T1<U>& unmapped, 
  27.         V (U::*method)() const)
  28.     {
  29.         T2<V> collection;
  30. 	for (typename T1<U>::iterator i = unmapped.begin(); i != unmapped.end(); ++i)
  31.             collection.insert(collection.end(), ((*i).*method)());
  32.  
  33.         return collection;
  34.     }
  35.  
  36. int main()
  37. {
  38.     vector<Container> containers;
  39.     for (int i = 0; i < 10; ++i) containers.push_back((Container(i)));
  40.  
  41.     set<int> contained = WugMap<Container, int, std::vector, std::set>(containers, &Container::get_i);
  42.     for (set<int>::iterator derp = contained.begin(); derp != contained.end(); ++derp) cout << *derp << " " << endl;
  43. }
Success #stdin #stdout 0s 3020KB
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https://ideone.com/S0JmR
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
secret

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