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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. struct Default_t{} Default;
  5. struct Toggle_t{} Toggle;
  6.  
  7. struct FlagSet{
  8. 	uint m_set;
  9. 	uint m_reset;
  10.  
  11. 	constexpr FlagSet operator|(const FlagSet other) const{
  12. 		return {
  13. 			~m_reset & other.m_set & ~other.m_reset |
  14. 			~m_set & other.m_set & other.m_reset |
  15. 			m_set & ~other.m_set,
  16. 			m_reset & ~other.m_reset |
  17. 			~m_set & ~other.m_set & other.m_reset|
  18. 			~m_reset & other.m_set & other.m_reset};
  19. 	}
  20.  
  21. 	constexpr FlagSet& operator|=(const FlagSet other){
  22. 		*this = *this|other;
  23. 		return *this;
  24. 	}
  25. };
  26.  
  27. struct Flag{
  28. 	const uint m_bit;
  29.  
  30. 	constexpr FlagSet operator= (bool val) const{
  31. 		return {(uint)val<<m_bit,(!(uint)val)<<m_bit};
  32. 	}
  33.  
  34. 	constexpr FlagSet operator= (Default_t) const{
  35. 		return {0u,0u};
  36. 	}
  37.  
  38. 	constexpr FlagSet operator= (Toggle_t) const {
  39. 		return {1u<<m_bit,1u<<m_bit};
  40. 	}
  41.  
  42. 	constexpr uint operator& (FlagSet i) const{
  43. 		return i.m_set & (1u<<m_bit);
  44. 	}
  45.  
  46. 	constexpr operator FlagSet() const{
  47. 		return {1u<<m_bit,0u}; //= set
  48. 	}
  49.  
  50. 	constexpr FlagSet operator|(const Flag other) const{
  51. 		return (FlagSet)*this|(FlagSet)other;
  52. 	}
  53. 	constexpr FlagSet operator|(const FlagSet other) const{
  54. 		return (FlagSet)*this|other;
  55. 	}
  56. };
  57.  
  58. constexpr uint operator& (FlagSet i, Flag f){
  59. 	return f & i;
  60. }
  61.  
  62.  
  63. constexpr Flag Flag1{0};
  64. constexpr Flag Flag2{1};
  65. constexpr Flag Flag3{2};
  66.  
  67. constexpr auto NoFlag1 = (Flag1=false);
  68.  
  69.  
  70. void foo(FlagSet f={0,0}){
  71. 	f |= Flag1|Flag2;
  72. 	cout << ((f & Flag1)?"1":"0");
  73. 	cout << ((f & Flag2)?"2":"0");
  74. 	cout << ((f & Flag3)?"3":"0");
  75. 	cout << endl;
  76. }
  77.  
  78. int main() {
  79.  
  80. 	foo();
  81. 	foo(Flag3);
  82. 	foo(Flag3|(Flag2=false));
  83. 	foo(Flag3|NoFlag1);
  84. 	foo((Flag1=Toggle)|(Flag2=Toggle)|(Flag3=Toggle));
  85.  
  86. 	return 0;
  87. }
Success #stdin #stdout 0s 3460KB
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https://ideone.com/Tidfwm
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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