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  1. #include <iostream>
  2. #include <bitset>
  3.  
  4. template <size_t N> 
  5. class twoBit
  6. {
  7.   typedef typename std::bitset<2*N>::reference bitRef;
  8.   bitRef a, b;
  9. public:
  10.   twoBit(bitRef a1, bitRef b1): a(a1), b(b1) {};
  11.   const twoBit &operator=(int i) { a = i%2; b = i/2; return *this; };
  12.   operator int() { return 2*b + a; };
  13. };
  14.  
  15. template <size_t N> 
  16. class twoBitSet : private std::bitset<2*N>
  17. {
  18.   typedef typename std::bitset<2*N>::reference bitRef;
  19. public:
  20.   twoBit<N> operator[](int index)
  21.   {
  22.     bitRef b1 = std::bitset<2*N>::operator[](2*index);
  23.     bitRef b2 = std::bitset<2*N>::operator[](2*index + 1);
  24.     return twoBit<N>(b1, b2);
  25.   };
  26. };
  27.  
  28. int main()
  29. {
  30.     twoBitSet<32> bs;
  31.     bs[0] = 2;
  32.     bs[1] = 3;
  33.     bs[2] = 1;
  34.     bs[3] = 0;
  35.     std::cout << bs[0] << std::endl; // prints 2
  36.     std::cout << bs[1] << std::endl; // prints 3
  37.     std::cout << bs[2] << std::endl; // prints 1
  38.     std::cout << bs[3] << std::endl; // prints 0
  39. }
Success #stdin #stdout 0s 3296KB
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https://ideone.com/XJwWeM
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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