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  1. #include <iostream>
  2.  
  3. template <int F>
  4. struct fp
  5. {
  6. 	enum { BITS = F };
  7. 	int s;
  8.  
  9. 	fp(const int32_t & b) : s(b << F) { }
  10. 	fp(const float & b) : s(b * (1 << F)) { }
  11. 	template<int T>
  12. 	fp(const fp<T> & b) { *this = b; }
  13.  
  14. 	fp & operator=(const int32_t & b) { s = b << F; return *this; }
  15. 	fp & operator=(const float & b) { s = b * (1 << F); return *this; }
  16. 	fp & operator=(const fp & b) { s = b.s; return *this; }
  17.  
  18. 	template<int T>
  19. 	fp & operator=(const fp<T> & b)
  20. 	{
  21. 		if (T > F) { s = b.s >> (T - F); }
  22. 		else if (T < F) { s = b.s << (F - T); }
  23. 		else { s = b.s; }
  24. 		return *this;
  25. 	}
  26.  
  27. 	/*fp & operator=(const int32_t & b)
  28. 	{
  29. 		s = b << F;
  30. 		return *this;
  31. 	}
  32.  
  33. 	fp & operator=(const float & b)
  34. 	{
  35. 		s = b * (1 << F);
  36. 		return *this;
  37. 	}*/
  38.  
  39. 	friend std::ostream & operator<<(std::ostream & os, const fp<F> & a) { os << a.s; return os; }
  40. };
  41.  
  42. using fp824 = fp<24>;
  43. using fp1616 = fp<16>;
  44. using fp248 = fp<8>;
  45.  
  46. int main() {
  47. 	// your code goes here
  48. 	fp1616 a0(0); // error: ambiguous?!
  49. 	fp1616 a1(1); // error: ambiguous?!
  50. 	fp1616 a2(2); // error: ambiguous?!
  51. 	fp1616 a3(-2.5f);
  52. 	std::cout << a0 << std::endl;
  53. 	std::cout << a1 << std::endl;
  54. 	std::cout << a2 << std::endl;
  55. 	std::cout << a3 << std::endl;
  56. 	a0 = 5; // error: ambiguous?!
  57. 	a0 = 0; // error: ambiguous?!
  58. 	a0 = 3.4f;
  59. 	fp824 b1(1.2f);
  60. 	fp1616 b2(b1);
  61. 	fp248 b3(b2);
  62. 	b1 = b3;
  63. 	b1 = b2;
  64. 	return 0;
  65. }
Success #stdin #stdout 0s 15240KB
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https://ideone.com/0u2xnh
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
public

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