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  1. #include <vector>
  2.  
  3. template <typename TopContainer, typename TopElement, typename BottomContainer>
  4. void genericFoo(const TopContainer& topList, BottomContainer TopElement::* bottomList) 
  5. {
  6.     for (auto it = topList.begin(); it != topList.end(); ++it) {
  7.         // ...
  8.         const BottomContainer& list2 = (*it).*bottomList;
  9.         for (auto it2 = list2.begin(); it2 != list2.end(); ++it2) {
  10.             // do some stuff
  11.         }
  12.     }
  13. }
  14.  
  15. struct listA {
  16.     std::vector<char> listOfApples;    
  17. };
  18.  
  19. struct listB {
  20.     std::vector<int> listOfToys;
  21. };
  22.  
  23. std::vector<listA> listOfItems1;
  24. std::vector<listB> listOfItems2;
  25.  
  26.  
  27. int main()
  28. {
  29.     std::vector<int> listB::*pList = &listB::listOfToys;
  30.     genericFoo(listOfItems2, pList);
  31.     return 0;
  32. }
Success #stdin #stdout 0s 2924KB
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https://ideone.com/FtVHV6
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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