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  1. #include <iostream>
  2.  
  3. static const double PI = 3.14159265358979323846;
  4.  
  5. // Forward declarations
  6. template< typename T > class radians;
  7. template< typename T > class degrees;
  8.  
  9. template< typename T >
  10. class degrees
  11. {
  12. public:
  13. 	degrees(const T value)
  14. 		: value_(value)
  15. 	{}
  16.  
  17. 	template< typename U >
  18. 	explicit operator U() const
  19. 	{
  20. 		return value_ * PI / 180.0;
  21. 	}
  22.  
  23. 	T value() const { return value_; }
  24.  
  25. private:
  26. 	T value_;
  27. };
  28.  
  29.  
  30. template< typename T >
  31. class radians
  32. {
  33. public:
  34. 	radians(const T value)
  35. 		: value_(value)
  36. 	{}
  37.  
  38. 	template< typename U >
  39. 	explicit operator U() const
  40. 	{
  41. 		return (value_* 180.0) / PI;
  42. 	}
  43.  
  44. 	T value() const { return value_; }
  45.  
  46. private:
  47. 	T value_;
  48. };
  49.  
  50. template< typename T >
  51. std::ostream& operator<<(std::ostream& out, const radians<T>& r)
  52. {
  53. 	return out << r.value() << "r";
  54. }
  55.  
  56. template< typename T >
  57. std::ostream& operator<<(std::ostream& out, const degrees<T>& r)
  58. {
  59. 	return out << r.value() << "d";
  60. }
  61.  
  62.  
  63. int main()
  64. {
  65. 	using degs = degrees<float>;
  66. 	using rads = radians<float>;
  67.  
  68. 	auto d = degs{10};
  69. 	auto r = static_cast<rads>(d);
  70.  
  71. 	std::cout << d << std::endl;
  72. 	std::cout << r << std::endl;
  73.  
  74. 	return 0;
  75. }
Success #stdin #stdout 0s 3296KB
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10d
0.174533r
https://ideone.com/xIxZQC
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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