fork download
copy 
  1. #include <memory>
  2.  
  3. class interface_d
  4. {
  5. public:
  6. 	virtual ~interface_d() {}
  7. 	virtual interface_d* clone() const = 0;
  8.  
  9. };
  10.  
  11. class d1
  12. 	: public interface_d
  13. {
  14. public:
  15. 	d1() : interface_d(), m_x(new int) {}
  16. 	d1(const d1 &rhs) : interface_d(), m_x(new int(*rhs.m_x)) {}
  17. 	virtual ~d1()
  18. 	{
  19. 		delete m_x;
  20. 	}
  21.  
  22. 	virtual interface_d* clone() const
  23. 	{
  24. 		return new d1(*this);
  25. 	}
  26.  
  27. private:
  28. 	int *m_x;
  29. };
  30.  
  31. class base
  32. {
  33. public:
  34. 	base(std::unique_ptr<interface_d> impl) : m_impl(std::move(impl)) {}
  35. 	base(const base &rhs) : m_impl(rhs.m_impl->clone()) {}
  36. 	base& operator=(const base &rhs)
  37. 	{
  38. 		if (this != &rhs)
  39. 		{
  40. 			std::unique_ptr<interface_d> tmp(rhs.m_impl->clone());
  41. 			std::swap(m_impl, tmp);
  42. 		}
  43. 		return *this;
  44. 	}
  45. 	~base()
  46. 	{
  47. 		// ... do something before clear impl
  48. 		m_impl.reset();
  49. 		// ... do something after clear impl
  50. 	}
  51.  
  52. private:
  53. 	std::unique_ptr<interface_d> m_impl;
  54. };
  55.  
  56. int main() {
  57.  
  58. 	base x(std::unique_ptr<d1>(new d1));
  59. 	base y(x);
  60.  
  61. 	return 0;
  62. }
Success #stdin #stdout 0s 3468KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
Standard output is empty
https://ideone.com/4kEgWo
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!