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  1. #include <iostream>
  2. #include <cassert>
  3.  
  4. template<class T, char STEP = 1>
  5. class simple_container
  6. {
  7. 	class simple_iterator;
  8. public:
  9. 	simple_container(const T &val) : _value(val)
  10. 	{
  11. 		if (std::abs(STEP) != 1 && std::abs(STEP) != 2)
  12. 		{
  13. 			assert(STEP % 4 == 0);
  14. 			assert(STEP != 0);
  15. 		}
  16.  
  17. 	}
  18.  
  19. 	simple_iterator begin()
  20. 	{
  21. 		return (STEP > 0 ? simple_iterator(_value, STEP, 0) : simple_iterator(_value, STEP, static_cast<long>(sizeof (T) * 8) + STEP));
  22.  
  23. 	}
  24. 	simple_iterator end()
  25. 	{
  26. 		return (STEP > 0 ? simple_iterator(_value, STEP, sizeof (T) * 8) : simple_iterator(_value, STEP, STEP));
  27. 	}
  28. private:
  29. 	class simple_iterator
  30. 	{
  31. 	public:
  32. 		bool operator!=(const simple_iterator&l)
  33. 		{
  34. 			return (_info.pos != l._info.pos) ||
  35. 					(_info.step != l._info.step) ||
  36. 					(_val != l._val);
  37. 		}
  38. 		unsigned char operator*()
  39. 		{
  40. 			return static_cast<unsigned char>((_val >> _info.pos) & (~(0xFF << (_info.step > 0 ? _info.step : -_info.step))));
  41. 		}
  42.  
  43. 		simple_iterator& operator++()
  44. 		{
  45. 			_info.pos += _info.step;
  46. 			return *this;
  47. 		}
  48. 	private:
  49. 		friend class simple_container;
  50.  
  51. 		simple_iterator(const T &val, char step, long pos)
  52. 			: _info{pos, step}, _val(val) {}
  53.  
  54. 		struct _info_data
  55. 		{
  56. 			long pos;
  57. 			char step;
  58. 		};
  59. 		_info_data _info;
  60. 		const T &_val;
  61.  
  62. 	};
  63. 	const T &_value;
  64. };
  65.  
  66. int main() {
  67. 	unsigned char val = 0b11111001;
  68. 	simple_container<unsigned char, 1> v(val);
  69. 	for(auto el : v)
  70. 		std::cout << std::hex<< static_cast<int>(el);
  71. 	std::cout << std::endl;
  72.  
  73.  
  74. 	simple_container<unsigned char, -1> rv(val);
  75. 	for(auto el : rv)
  76. 		std::cout << std::hex<< static_cast<int>(el);
  77. 	std::cout << std::endl;
  78.  
  79. 	return 0;
  80. }
  81.  
Success #stdin #stdout 0s 4576KB
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stdin
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Standard input is empty
stdout
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10011111
11111001
https://ideone.com/x861ux
language:
C++ 4.3.2 (gcc-4.3.2)
created:
5 years ago
visibility:
public

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