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  1. #include <iostream>
  2. #include <initializer_list>
  3.  
  4. class arr1D
  5. {
  6. protected:
  7. 	int size;
  8. 	int *arr;
  9. public:
  10. 	arr1D(const std::initializer_list<int>& input) : size(input.size())
  11. 	{
  12. 		int* temp = new int[size];
  13. 		int index = 0;
  14. 		for (const auto& it : input)
  15. 		{
  16. 			temp[index] = it;
  17. 			++index;
  18. 		}
  19. 		arr = temp;
  20. 	}
  21.  
  22. 	arr1D(int siz = 10) :size(siz), arr(new int[size] {0})  // this will also do the same job
  23. 		{}
  24. 	~arr1D()                          //check rule of 3:  also need operator= and copy assignment con.
  25. 	{
  26. 		delete arr;
  27. 	}
  28. 	friend std::ostream & operator<<(std::ostream &, const arr1D &);
  29. };
  30. int main()
  31. {
  32. 	arr1D a1 = { 1,2,3,4,5 };
  33. 	std::cout << a1 << std::endl;
  34.  
  35. 	arr1D a2;
  36. 	std::cout << a2 << std::endl;
  37.  
  38. 	std::cin.get();
  39. }
  40. std::ostream & operator<<(std::ostream &_return, const arr1D &a)
  41. {
  42. 	_return << "arr: ";
  43. 	for (int i = 0; i<a.size; i++)
  44. 	{
  45. 		std::cout << *(a.arr + i) << " ";
  46. 	}
  47. 	_return << "size: " << a.size;
  48. 	return _return;
  49. }
  50.  
  51.  
Success #stdin #stdout 0s 4340KB
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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/3uTJvJ
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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