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  1. #include <iostream>
  2.  
  3. template<typename T> class Table
  4. {
  5. private:
  6.     int width, height, p2;
  7.     T *data;
  8. public:
  9.     class Column
  10.     {
  11.     private:
  12.         T* & data;
  13.         int & x;
  14.         int & p2;
  15.     public:
  16.         Column(T* & data, int & x, int & p2) :data(data), x(x), p2(p2) {}
  17.         T & operator[](int y)
  18.         {
  19.             return data[x + (y<<p2)];
  20.         }
  21.     };
  22.     Table(int width, int height, T fill)
  23.     {
  24.         this->width = width;
  25.         this->height = height;
  26.         this->p2 = 32 - __builtin_clz(width - 1);
  27.         int len = height * sizeof(T) << p2;
  28.         this->data = new T[len];
  29.         for (int i = 0; i < len; i++) data[i] = fill;
  30.     }
  31.     Column operator[](int x)
  32.     {
  33.         return Column(data, x, p2);
  34.     }
  35. };
  36.  
  37. int main()
  38. {
  39.     Table<int> Table(100, 200, 73);
  40.     Table[10][20] = 100;
  41.     std::cout << Table[9][19] << " " << Table[10][20] << " " << Table[11][21] << std::endl;
  42.     return 0;
  43. }
  44.  
Success #stdin #stdout 0s 4332KB
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Standard input is empty
stdout
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73 100 73
https://ideone.com/zne3Ww
language:
C++ (gcc 8.3)
created:
3 years ago
visibility:
public

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