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  1. #include <initializer_list>
  2. #include <algorithm>
  3. #include <iostream>
  4. #include <memory>
  5.  
  6. template <class T> class test
  7. {
  8. private:
  9.     std::unique_ptr<T[]> arr;
  10. public:
  11.     std::size_t rows;
  12.     std::size_t cols;
  13.     test(std::initializer_list<std::initializer_list<T>> r) : rows(r.size())
  14.     {
  15.         using init = const std::initializer_list<T>;
  16.         cols = std::max_element(r.begin(), r.end(), [](init& lhs, init& rhs)
  17.                                                     {return lhs.size() < rhs.size();}
  18.                                )->size();
  19.         arr = std::unique_ptr<T[]>(new T[rows*cols]);
  20.         auto source = r.begin();
  21.         auto dest = &arr[0];
  22.         do  {
  23.             std::copy(source->begin(), source->end(), dest);
  24.             dest += cols;
  25.         } while(++source != r.end());
  26.     }
  27.     T* operator[](std::size_t index)
  28.     {
  29.         return &arr[0] + index*cols;
  30.     }
  31. };
  32.  
  33. int main()
  34. {
  35.     test<int> a = {{1, 2, 3}, {4, 5, 6}};
  36.     for(std::size_t i = 0; i < a.rows; ++i) {
  37.         for(std::size_t j = 0; j < a.cols; ++j)
  38.             std::cout << a[i][j] << ' ';
  39.         std::cout << '\n';
  40.     }
  41. }
  42.  
Success #stdin #stdout 0s 3472KB
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https://ideone.com/8ZRNSD
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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