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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. template<class T>
  5. class shr_ptr
  6. {
  7.         T* resource;
  8.         int* count; 
  9. public:
  10.         shr_ptr():resource(NULL),count(NULL)
  11.         {
  12.  
  13.         } 
  14.  
  15.         shr_ptr(T* res):resource(res)
  16.         {
  17.                 count = new int(1);
  18.         } 
  19.  
  20.         shr_ptr(const shr_ptr<T>& R)
  21.         {
  22.                 if(R.resource!=NULL)
  23. 		{
  24. 			resource = R.resource;
  25. 			count = R.count;
  26. 			*count = *R.count+1;
  27. 		}
  28.         } 
  29.  
  30.         ~shr_ptr()
  31.         {
  32.                 if(resource!=NULL && --*(count)==0)
  33. 		{
  34. 			delete resource;
  35. 			delete count;
  36. 			resource = NULL;
  37. 		}
  38.         }
  39.  
  40.        shr_ptr<T>& operator = (const shr_ptr<T>& R)
  41.        {
  42.                 if(R.resource != this->resource)
  43. 		{
  44. 			*count--;
  45.                          resource = R.resource;
  46.                          count = R.count;
  47.                          *count++;
  48. 		}
  49.                 return *this;
  50.        }
  51.  
  52.         T* operator ->() const 
  53.         {
  54.                 return resource;
  55.         }
  56.  
  57.         T& operator * () const 
  58.         {
  59.                 return *resource;
  60.         }
  61.  
  62.         T* get () const 
  63.         {
  64.                 return resource;
  65.         }
  66. };
  67.  
  68.  
  69.  
  70. class A
  71. {
  72. public:
  73. 	A()
  74. 	{
  75. 		cout << "created\n";
  76. 	}
  77. 	~A()
  78. 	{
  79. 		cout << "deleted\n";
  80. 	}
  81. };
  82.  
  83. int main() 
  84. {
  85. 	shr_ptr<A> sh1 = new A;
  86. 	shr_ptr<A> sh2 = new A;
  87.  
  88. 	sh1 = sh2;
  89.  
  90. 	return 0;
  91. }
Success #stdin #stdout 0s 3468KB
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created
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https://ideone.com/ajkyDX
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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