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  1. #include <vector>
  2. #include <iostream>
  3. #include <memory>
  4.  
  5. template<typename T, size_t nDimensions>
  6. class MArray;
  7.  
  8. template<typename T, size_t nDimensions>
  9. class MArrayProxy : public MArrayProxy<T, nDimensions - 1>
  10. {
  11. public:
  12. 	MArrayProxy(MArray<T, nDimensions> &arr)
  13. 		: MArrayProxy<T, nDimensions - 1>(arr)
  14. 	{
  15. 	}
  16.  
  17. 	MArrayProxy<T, nDimensions - 1> &operator[](size_t idx)
  18. 	{
  19. 		this->position += idx * reinterpret_cast<MArray<T, nDimensions>&>(this->arr).elementSize;
  20. 		return *this;
  21. 	}
  22. };
  23.  
  24. template<typename T>
  25. class MArrayProxy<T, 1>
  26. {
  27. public:
  28. 	MArrayProxy(MArray<T, 1> &arr)
  29. 		: position(0), arr(arr)
  30. 	{
  31. 	}
  32.  
  33. 	T &operator[](size_t idx)
  34. 	{
  35. 		position += idx;
  36. 		return arr[position];
  37. 	}
  38.  
  39. protected:
  40. 	size_t position;
  41. 	MArray<T, 1> &arr;
  42. };
  43.  
  44.  
  45. template<typename T, size_t nDimensions>
  46. class MArray : public MArray<T, nDimensions - 1>
  47. {
  48. public:
  49. 	template<typename... SizeTypes>
  50. 	MArray(typename std::enable_if<sizeof...(SizeTypes) == nDimensions - 2, size_t>::type sz, size_t sz2, SizeTypes... sizes)
  51. 		: MArray<T, nDimensions - 1>(sz * sz2, sizes...)
  52. 		, elementSize(sz2 * MArray<T, nDimensions - 1>::elementSize)
  53. 	{
  54. 	}
  55.  
  56. 	MArrayProxy<T, nDimensions - 1> operator[](size_t idx)
  57. 	{
  58. 		return MArrayProxy<T, nDimensions>(*this)[idx];
  59. 	}
  60.  
  61. protected:
  62. 	friend class MArrayProxy<T, nDimensions>;
  63. 	size_t elementSize;
  64. };
  65.  
  66. template<typename T>
  67. class MArray<T, 1>
  68. {
  69. public:
  70. 	MArray(size_t sz)
  71. 		: data(new T[sz])
  72. 	{
  73. 	}
  74.  
  75. 	T &operator[](size_t idx)
  76. 	{
  77. 		return data[idx];
  78. 	}
  79.  
  80. protected:
  81. 	std::unique_ptr<T[]> data;
  82. 	const size_t elementSize = 1;
  83. };
  84.  
  85. int main()
  86. {
  87. 	int n, m;
  88. 	std::cin >> n >> m;
  89.  
  90. 	MArray<int, 2> matrix(n, m);
  91.  
  92. 	for (int i = 0; i < n; i++) {
  93. 		for (int j = 0; j < m; j++) {
  94. 			std::cin >> matrix[i][j];
  95. 		}
  96. 	}
  97.  
  98. 	for (int i = 0; i < n; i++) {
  99. 		for (int j = 0; j < m; j++) {
  100. 			std::cout << matrix[i][j] << " ";
  101. 		}
  102. 		std::cout << std::endl;
  103. 	}
  104. }
Success #stdin #stdout 0s 3472KB
comments (?)
stdin 
2 3
1 2 3
4 5 6
stdout 
1 2 3 
4 5 6
https://ideone.com/MY6bDv
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
secret

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