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  1. #include <iostream>
  2. #include <vector>
  3.  
  4. class Row //Proxy
  5. {
  6.     public:
  7.        Row(std::size_t size=0)
  8.          :cols_(size){};
  9.  
  10.        int& operator[](int index) { return cols_[index]; } 
  11.        const int& operator[](int index)  const { return cols_[index]; } 
  12.     private:
  13.        std::vector<int> cols_; // или std::array<> или просто обычный массив.
  14. };
  15.  
  16. class Matrix
  17. {
  18. 	public:
  19.       Matrix(std::size_t rowSize, std::size_t colSize) 
  20.         :rows_(rowSize, Row(colSize) ){}
  21.  
  22.       Row& operator[](int index) { return rows_[index]; } 
  23.       const Row& operator[](int index)const { return rows_[index]; } 
  24.  
  25.     private:
  26.       std::size_t colSize_;
  27.       std::vector<Row> rows_;
  28. };
  29.  
  30.  
  31. int main() 
  32. {
  33.     Matrix  m(3,4);
  34.  
  35.     m[2][2]= 5;
  36.  
  37.     std::cout<< m[2][2] << std::endl;
  38.  
  39. 	return 0;
  40. }
Success #stdin #stdout 0s 3468KB
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https://ideone.com/0beYw8
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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