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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. template <typename T>
  5. class s_ptr
  6. {
  7. public:
  8. 	s_ptr<T>(T* ptr)
  9. 	{
  10. 		ref_count = new size_t(1);
  11. 		this->ptr = ptr;
  12. 	}
  13. 	s_ptr<T>(const s_ptr<T>& rhs)
  14. 	{
  15. 		this->ref_count = rhs.ref_count;
  16. 		this->ptr = rhs.ptr;
  17. 		(*ref_count)++;
  18. 	}
  19. 	~s_ptr<T>()
  20. 	{
  21. 		cout << "Ref count: " << count() << endl;
  22. 		if (ref_count && (*ref_count) == 1)
  23. 		{
  24. 			delete ref_count;
  25. 			delete ptr;
  26. 			return;
  27. 		}
  28. 		(*ref_count)--;
  29. 	}
  30.  
  31. 	s_ptr<T>& operator=(const s_ptr<T>& rhs)
  32. 	{
  33. 		if (this != &rhs)
  34. 		{
  35. 			ptr = rhs.ptr;
  36. 			ref_count = rhs.ref_count;
  37. 			(*ref_count)++;
  38. 		}
  39. 		return this;
  40. 	}
  41.  
  42. 	size_t count() const
  43. 	{
  44. 		return *ref_count;
  45. 	}
  46. private:
  47. 	T* ptr = nullptr;
  48. 	size_t* ref_count = nullptr;
  49. };
  50.  
  51. class Base
  52. {
  53. public:
  54. 	Base(){cout << "Base()\n";}
  55. 	~Base(){cout << "~Base()\n";}
  56. };
  57.  
  58. int main() {
  59. 	// your code goes here
  60. 	s_ptr<Base> b(new Base());
  61. 	s_ptr<Base> bb = b;
  62. 	s_ptr<Base> bbb(bb);
  63. 	return 0;
  64. }
Success #stdin #stdout 0.01s 5516KB
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Standard input is empty
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Base()
Ref count: 3
Ref count: 2
Ref count: 1
~Base()
https://ideone.com/YXpeEP
language:
C++14 (gcc 8.3)
created:
1 year ago
visibility:
public

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