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  1. #include <iostream>
  2. #include <initializer_list>
  3. #include <memory>
  4.  
  5. class arr1D
  6. {
  7. protected:
  8. 	int size;
  9. 	std::unique_ptr<int[]> arr;
  10. public:
  11. 	arr1D(const std::initializer_list<int>& input) : size(input.size())
  12. 	{
  13. 		arr = std::unique_ptr<int[]>(new int[size]);
  14. 		int index = 0;
  15. 		for (const auto& it : input)
  16. 		{
  17. 			arr[index] = it;
  18. 			++index;
  19. 		}
  20. 	}
  21.  
  22. 	arr1D(int siz = 10) :size(siz), arr(new int[size] {0})  // this will also do the same job
  23. 		{}
  24. 	friend std::ostream & operator<<(std::ostream &, const arr1D &);
  25. };
  26. int main()
  27. {
  28. 	arr1D a1 = { 1,2,3,4,5 };
  29. 	std::cout << a1 << std::endl;
  30.  
  31. 	arr1D a2;
  32. 	std::cout << a2 << std::endl;
  33.  
  34. 	std::cin.get();
  35. }
  36. std::ostream & operator<<(std::ostream &_return, const arr1D &a)
  37. {
  38. 	_return << "arr: ";
  39. 	for (int i = 0; i< a.size; i++)  std::cout << a.arr[i] << " ";
  40.  
  41. 	_return << "size: " << a.size;
  42. 	return _return;
  43. }
  44.  
  45.  
Success #stdin #stdout 0s 4368KB
comments (?)
stdin
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Standard input is empty
stdout
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arr: 1 2 3 4 5 size: 5
arr: 0 0 0 0 0 0 0 0 0 0 size: 10
https://ideone.com/FdEbB1
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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