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  1. #include <memory>
  2. #include <iostream>
  3.  
  4. template<typename T, typename TPtr>
  5. struct Deep
  6. {
  7. 	TPtr ptr;
  8.  
  9. 	Deep() : ptr(new T) {}
  10.  
  11. 	T get() const { return *ptr; }
  12. 	void set(T t) { *ptr = t; }
  13.  
  14. 	Deep(const Deep& other): ptr(new T(*other.ptr)) {}
  15. };
  16.  
  17. template<typename T, typename TPtr>
  18. struct Shallow
  19. {
  20. 	TPtr ptr;
  21.  
  22. 	Shallow() : ptr(new T) {}
  23.  
  24. 	T get() const { return *ptr; }
  25. 	void set(T t) { *ptr = t; }
  26.  
  27. 	Shallow(const Shallow& other) = default;
  28. };
  29.  
  30. template<typename T>
  31. using raw_ptr = T*;
  32.  
  33. template<typename T>
  34. void test(const T& a1)
  35. {
  36. 	auto a2 = a1;
  37. 	a2.set(a2.get() + 1);
  38. 	std::cout << a1.get() << " " << a2.get() << std::endl;	
  39. }
  40.  
  41. using std::shared_ptr;
  42.  
  43. int main()
  44. {
  45. 	Deep<int, raw_ptr<int> > rawDeep;
  46. 	rawDeep.set(1);
  47. 	test(rawDeep);
  48.  
  49. 	Deep<int, shared_ptr<int> > sharedDeep;
  50. 	sharedDeep.set(1);
  51. 	test(sharedDeep);
  52.  
  53. 	Shallow<int, raw_ptr<int> > rawShallow;
  54. 	rawShallow.set(1);
  55. 	test(rawShallow);
  56.  
  57. 	Shallow<int, shared_ptr<int> > sharedShallow;
  58. 	sharedShallow.set(1);
  59. 	test(sharedShallow);
  60. }
Success #stdin #stdout 0s 3232KB
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https://ideone.com/NltfUO
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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