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  1. #include <map>
  2. #include <iostream>
  3. namespace mylib
  4. {
  5. 	enum visual
  6. 	{
  7. 		v_binary,
  8. 		v_decimal
  9. 	};
  10. }
  11. namespace
  12. {
  13. 	::std::map< std::ostream const*, mylib::visual> _association;
  14. }
  15. namespace mylib
  16. {
  17. 	template<visual _v>
  18. 	struct manip
  19. 	{
  20. 		const static visual v = _v;
  21. 	};
  22. 	const manip<v_binary> binary;
  23. 	const manip<v_decimal> decimal;
  24. 	template<visual _v>
  25. 	::std::ostream& operator<< (::std::ostream& os, manip<_v> const& manipulator)
  26. 	{
  27. 		::_association[&os] = manipulator.v;
  28. 		return os;
  29. 	}
  30. 	class storage
  31. 	{
  32. 		char _c;
  33. 	public:
  34. 		storage(char c = 0) : _c(c) {}
  35. 		void set(char c) { _c = c; }
  36. 		char get() const { return _c; }
  37. 	};
  38. 	::std::ostream& operator<< (::std::ostream& os, storage const& data)
  39. 	{
  40. 		if(::_association[&os] == v_binary)
  41. 		{
  42. 			os << data.get();
  43. 		}
  44. 		else if(::_association[&os] == v_decimal)
  45. 		{
  46. 			os << static_cast<int>(data.get());
  47. 		}
  48. 		else
  49. 		{
  50. 			// enum-exception
  51. 		}
  52. 		return os;
  53. 	}
  54. }
  55. int main()
  56. {
  57. 	mylib::storage inst('h');
  58. 	std::cout << mylib::binary << inst << '\n';
  59. 	std::cout << mylib::decimal << inst << '\n';
  60. }
Success #stdin #stdout 0s 3432KB
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h
104
https://ideone.com/m1yJ25
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
secret

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