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  1. #include <iostream>
  2. #include <set>
  3.  
  4.  
  5. template <typename Content>
  6. struct SetWith {
  7. 	std::set<Content> set;
  8. };
  9.  
  10. template <typename... Contents>
  11. struct SetsContainer {};
  12.  
  13. template <typename Content, typename... OtherContents>
  14. struct SetsContainer<Content, OtherContents...> : public SetsContainer<OtherContents...>, public SetWith<Content> {};
  15.  
  16. template <typename... Contents>
  17. struct Sets {
  18. 	SetsContainer<Contents...> sets;
  19. 	template <typename C>
  20. 	std::set<C> & set_of(void) {
  21. 		return static_cast<SetWith<C> *>(&sets)->set;
  22. 	}
  23. 	template <typename T>
  24. 	void add(T t) {
  25. 		set_of<typename std::decay<T>::type>().insert(std::forward<T>(t));
  26. 	}
  27. };
  28.  
  29. 	template <typename C, typename Container>
  30. 	std::set<C> & set_of(Container & sets) {
  31. 		return static_cast<SetWith<C> *>(&sets)->set;
  32. 	}
  33.  
  34. struct Foo {};
  35.  
  36. int main() {
  37. 	Sets<int, double, bool> s;
  38. 	SetsContainer<int, char, bool> s2;
  39. 	s.set_of<int>().insert(42);
  40. 	s.set_of<double>().insert(3.14);
  41. 	s.set_of<bool>().insert(true);
  42. 	s.add(1.0);
  43. 	s.add(3);
  44. 	double const ddd = 6.28;
  45. 	s.add(ddd);
  46. 	double xyz = 0.001;
  47. 	s.add(std::move(xyz));
  48. 	for (auto const & d : s.set_of<double>()) {
  49. 		std::cout << d << ", ";
  50. 	}
  51. 	std::cout << std::endl;
  52. 	set_of<bool>(s2).insert(false);
  53. //	s.get<Foo>();
  54. 	return 0;
  55. }
Success #stdin #stdout 0s 3472KB
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stdin
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Standard input is empty
stdout
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0.001, 1, 3.14, 6.28,
https://ideone.com/keEfvN
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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