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  1. #include <iostream>
  2. template <typename T>
  3. struct infinite_array 
  4. {
  5.     infinite_array() : data(NULL), array_length(0)
  6. 	{
  7.  
  8. 	}
  9.  
  10.     T& operator[](unsigned long long idx)
  11. 	{
  12. 		//if(idx + 1 > size()) 
  13. 		//{
  14. 		//	resize(idx+1);  
  15. 		//}
  16. 		return data[idx];
  17. 	}
  18.  
  19.     unsigned long long size() const
  20. 	{
  21. 	    return array_length;
  22. 	}
  23.  
  24.     void resize(unsigned long long idx)
  25. 	{
  26. 		std::cout << "Resize with idx " << idx << std::endl;
  27. 		T *temp = new T[idx];
  28. 		std::copy(data, data+size(), temp);
  29. 		delete [] data;
  30. 		data = temp;
  31. 		array_length = idx;
  32. 	}
  33.  
  34.     private:
  35.         T *data;
  36.         unsigned long long array_length;
  37. };
  38.  
  39. int main() 
  40. {
  41.     infinite_array<int> ar; 
  42.     ar.resize(10);
  43.     for(int i = 0; i < 10; ++i) 
  44. 	{
  45.         ar[i] = i;
  46.     }
  47.  
  48.     ar.resize(32);
  49.     ar[30] = ar[31] = 10;
  50.  
  51.     for(int i = 0; i < ar.size(); ++i)
  52.         std::cout << ar[i] << ' ';  
  53.     std::cout << std::endl;
  54.  
  55.     return 0;
  56. }
Success #stdin #stdout 0s 3472KB
comments (?)
stdin 
Standard input is empty
stdout 
Resize with idx 10
Resize with idx 32
0 1 2 3 4 5 6 7 8 9 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 10 10
https://ideone.com/s2pXcC
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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