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  1. #include <iostream>
  2. #include <vector>
  3. #include <initializer_list>
  4.  
  5. class Matrix {
  6. public:
  7.     Matrix(const std::initializer_list<std::initializer_list<double>>&);
  8.     void print(const int, const int) const;
  9. private:
  10.     const std::vector<std::vector<double>>::size_type d_row;
  11.     const std::vector<double>::size_type d_col;
  12.     std::vector<std::vector<double>> d_matrix;
  13. };
  14.  
  15. Matrix::Matrix(const std::initializer_list<std::initializer_list<double>>& list)
  16.        : d_row(list.size()), d_col((*list.begin()).size()) {
  17.     d_matrix.reserve(d_row);
  18.  
  19.     for (const auto& l : list) {
  20.         d_matrix.emplace_back(l);
  21.     }
  22. }
  23.  
  24. void Matrix::print(const int r, const int c) const {
  25.     std::cout << d_matrix[r][c] << std::endl;
  26. }
  27.  
  28. int main() {
  29.     Matrix m({ {1, 2, 3},
  30.                {3, 4, 2} });
  31.  
  32.     m.print(0, 0);
  33.     m.print(0, 1);
  34.     m.print(0, 2);
  35.     m.print(1, 0);
  36.     m.print(1, 1);
  37.     m.print(1, 2);
  38. }
Success #stdin #stdout 0s 3476KB
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https://ideone.com/jLq48Z
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
secret

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