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  1. #include <vector>
  2. #include <memory>
  3. #include <iostream>
  4. #include <typeinfo>
  5. using namespace std;
  6.  
  7. template <class TIteratorToPointerContainer>
  8. class Something
  9. {
  10. public:
  11.     typedef typename TIteratorToPointerContainer::value_type TPointer;
  12.     typedef typename TPointer::element_type        TValue;
  13. };
  14.  
  15. int main()
  16. {
  17.     Something<
  18.               typename std::vector< std::shared_ptr<int> >::iterator 
  19.               >::TPointer pointer;
  20.                       // "pointer" is of type std::shared_ptr<int>
  21.     Something< 
  22.               typename std::vector< std::shared_ptr<int> >::iterator 
  23.               >::TValue value;
  24.                     // "value" is of type int
  25.  
  26.   std::cout << "pointer-name = " << typeid(pointer).name() << endl;
  27.   std::cout << "value-name = " << typeid(value).name() << endl;
  28.     return 0;
  29. }
Success #stdin #stdout 0s 2896KB
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stdin
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Standard input is empty
stdout
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pointer-name = St10shared_ptrIiE
value-name = i
https://ideone.com/ByEvXj
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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