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  1. #include<iostream>
  2. using namespace std;
  3. template<class T>
  4. class SmartPtr
  5. {
  6.   T* ptr;
  7.   public:
  8.   SmartPtr(T* p=nullptr):ptr(p)
  9.   {
  10. 	cout <<"Constructor"<<endl;
  11.   }
  12.   //Copy Constructor
  13.   SmartPtr(const SmartPtr& a)
  14.   {
  15. 	cout <<"Copy Constructor"<<endl;
  16. 	ptr = new T;
  17. 	*ptr = *a.ptr;
  18.   }
  19.   //Copy assignment
  20.   SmartPtr& operator=(const SmartPtr& a )
  21.   {
  22.   	cout <<"Operator = "<<endl;
  23. 	if(&a==this)
  24. 	   return *this;
  25.  
  26. 	delete ptr;
  27. 	ptr = new T;
  28. 	*ptr = *a.ptr;
  29. 	return *this;
  30.   }
  31.  
  32.   //Move Constructor
  33.   SmartPtr(const SmartPtr&& a):ptr(a.ptr)
  34.   {
  35. 	  a.ptr = nullptr;
  36.   }
  37.  
  38.   //Move assignment
  39.   SmartPtr& operator=(const SmartPtr&& a)
  40.   {
  41. 	  if(&a == this)
  42. 		  return *this;
  43. 	  delete ptr;
  44. 	  // Transfer ownership of a.ptr to ptr
  45. 	  ptr = a.ptr;
  46. 	  a.ptr = nullptr;
  47.  
  48.   }
  49.   ~SmartPtr()
  50.   {
  51. 	cout <<"Destructor "<<endl;
  52. 	delete ptr;
  53.   }
  54.  
  55.   T& operator *(){return *ptr;}
  56.   T* operator ->(){return ptr;}
  57.  
  58. };
  59.  
  60.  
  61.  
  62. int main() {
  63. 	// your code goes here
  64. 	SmartPtr<int> sp (new int(5));
  65. 	cout <<"sp value : "<<*sp<<endl;
  66. 	SmartPtr<int> sp1 = sp;
  67. 	cout <<"sp1 value : "<<*sp1<<endl;
  68. 	SmartPtr<int> sp2(new int (10));
  69. 	cout <<"sp2 value before : "<<*sp2<<endl;
  70. 	sp2 = sp;
  71. 	cout <<"sp2 value after : "<<*sp2<<endl;
  72.  
  73. 	return 0;
  74. }
Success #stdin #stdout 0s 5664KB
comments (?)
stdin
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Standard input is empty
stdout
copy 
Constructor
sp value : 5
Copy Constructor
sp1 value : 5
Constructor
sp2 value before : 10
Operator = 
sp2 value after : 5
Destructor 
Destructor 
Destructor
https://ideone.com/2WDEcG
language:
C++ (gcc 8.3)
created:
2 years ago
visibility:
public

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