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  1. #include <iostream>
  2. #include <vector>
  3. #include <list>
  4. #include <algorithm>
  5. #include <iterator>
  6.  
  7. namespace my
  8. {
  9. 	template <typename Functor, typename SContainer>
  10. 	class map_proxy
  11. 	{
  12. 	public:
  13. 		map_proxy(Functor f, SContainer const & c)
  14. 			: m_f(f)
  15. 			, m_c(c)
  16. 		{
  17. 		}
  18.  
  19. 		template <typename TContainer>
  20. 		operator TContainer () const
  21. 		{
  22. 			TContainer c;
  23. 			std::transform(std::begin(m_c), std::end(m_c), std::back_inserter(c), m_f);
  24. 			return c;
  25. 		}
  26.  
  27. 	private:
  28. 		Functor m_f;
  29. 		SContainer const & m_c;
  30. 	};
  31.  
  32. 	template <typename Functor, typename Container>
  33. 	map_proxy<Functor, Container> map(Functor f, Container const & c)
  34. 	{
  35. 		return map_proxy<Functor, Container>(f, c);
  36. 	}
  37. }
  38.  
  39. int main()
  40. {
  41. 	using my::map;
  42.  
  43. 	std::vector<double> numbers = { 0.3, 0.4, 0.5, 0.6, 0.7 };
  44. 	std::list<int> result = map(
  45. 		[](double n) -> int { return static_cast<int>(n * 2.0 + 1) / 2; },
  46. 		numbers
  47. 	);
  48.  
  49. 	std::copy(std::begin(result), std::end(result), std::ostream_iterator<int>(std::cout, "\n"));
  50. 	return 0;
  51. }
  52.  
Success #stdin #stdout 0s 3472KB
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https://ideone.com/CnubMl
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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