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  1. #include<algorithm>
  2. #include<atomic>
  3. #include<array>
  4. #include<chrono>
  5. #include<condition_variable>
  6. #include<cstddef>
  7. #include<ctime>
  8. #include<fstream>
  9. #include<future>
  10. #include<iostream>
  11. #include<iterator>
  12. #include<limits>
  13. #include<memory>
  14. #include<mutex>
  15. #include<numeric>
  16. #include<sstream>
  17. #include<string>
  18. #include<vector>
  19. using namespace std;
  20.  
  21. template<class T>
  22. class Middle
  23. {
  24. public:
  25. 	using size_type=typename vector<T>::size_type;
  26. private:
  27. 	vector<T> *vec_;
  28. 	const size_type column_;
  29. 	const size_type index_;
  30. public:
  31. 	Middle(vector<T> &vec,const size_type column,const size_type index) noexcept
  32. 		:vec_{addressof(vec)},column_{column},index_{index}{}
  33. 	Middle(const Middle &)=default;
  34. 	operator T&()
  35. 	{
  36. 		return vec_->operator[](index_);
  37. 	}
  38. 	Middle& operator=(const Middle &)=delete;
  39. 	T& operator[](const size_t i)
  40. 	{
  41. 		return vec_->operator[](index_*column_+i);
  42. 	}
  43. };
  44.  
  45. template<class T>
  46. class Const_Middle
  47. {
  48. public:
  49. 	using size_type=typename vector<T>::size_type;
  50. private:
  51. 	const vector<T> *vec_;
  52. 	const size_type column_;
  53. 	const size_type index_;
  54. public:
  55. 	Const_Middle(const vector<T> &vec,const size_type column,const size_type index) noexcept
  56. 		:vec_{addressof(vec)},column_{column},index_{index}{}
  57. 	Const_Middle(const Const_Middle &)=default;
  58. 	operator const T&()
  59. 	{
  60. 		return vec_->operator[](index_);
  61. 	}
  62. 	Const_Middle& operator=(const Const_Middle &)=delete;
  63. 	const T& operator[](const size_t i)
  64. 	{
  65. 		return vec_->operator[](index_*column_+i);
  66. 	}
  67. };
  68.  
  69. template<class T>
  70. class Test
  71. {
  72. public:
  73. 	using size_type=typename vector<T>::size_type;
  74. 	vector<T> vec_;
  75. private:
  76. 	const size_type column_;
  77. public:
  78. 	Test(const size_type row,const size_type column)
  79. 		:column_{column},vec_(row*column){}
  80. 	Middle<T> operator[](const size_t i)
  81. 	{
  82. 		return Middle<T>{vec_,column_,i};
  83. 	}
  84. 	Const_Middle<T> operator[](const size_t i) const
  85. 	{
  86. 		return Const_Middle<T>{vec_,column_,i};
  87. 	}
  88. };
  89.  
  90. int main()
  91. {
  92. 	Test<int> test(3,4);
  93. 	iota(begin(test.vec_),end(test.vec_),0);
  94. 	const Test<int> &test2{test};
  95. 	cout<<test[6]<<endl;
  96. 	cout<<test[1][1]<<endl;
  97. 	cout<<test[2][3]<<endl;
  98. 	cout<<test2[6]<<endl;
  99. 	cout<<test2[1][1]<<endl;
  100. 	cout<<test2[2][3]<<endl;
  101. }
Success #stdin #stdout 0s 3468KB
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https://ideone.com/Tm4Bgk
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
secret

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