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  1. #include <iostream>
  2. #include <utility>
  3. #include <vector>
  4.  
  5. template <typename Container>
  6. class reverse_adaptor
  7. {
  8. public: // Construction
  9.     reverse_adaptor(Container &container) :
  10.         m_container(container)
  11.     {}
  12.  
  13. public: // STL container static polymorphism
  14.     auto begin() const -> decltype(std::declval<Container&>().rbegin())
  15.     {
  16.         return m_container.rbegin();
  17.     }
  18.  
  19.     auto end() const -> decltype(std::declval<Container&>().rend())
  20.     {
  21.         return m_container.rend();
  22.     }
  23.  
  24. private: // Members
  25.     Container &m_container;
  26. };
  27.  
  28. template <typename Container>
  29. 	reverse_adaptor<Container> make_reverse_adaptor(Container &container)
  30. 	{
  31. 		return reverse_adaptor<Container>(container);
  32. 	}
  33.  
  34. int main() 
  35. {
  36. 	std::vector<int> test = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
  37. 	for (const int i : make_reverse_adaptor(test))
  38. 	{
  39. 		std::cout << "i = " << i << std::endl;
  40. 	}
  41. 	return 0;
  42. }
Success #stdin #stdout 0s 3472KB
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stdin
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Standard input is empty
stdout
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i = 10
i = 9
i = 8
i = 7
i = 6
i = 5
i = 4
i = 3
i = 2
i = 1
https://ideone.com/aQ8Apa
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
secret

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