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  1. #include <cassert>
  2. #include <iostream>
  3.  
  4. using namespace std;
  5.  
  6. template <typename T>
  7. class scoped_ptr {
  8.  public:
  9.   scoped_ptr() = delete;
  10.   explicit scoped_ptr(T *ptr) : _ptr(ptr) {}
  11.   virtual ~scoped_ptr() { reset(); }
  12.  
  13.   scoped_ptr(const scoped_ptr &p) = delete;
  14.   scoped_ptr &operator=(const scoped_ptr &p) = delete;
  15.  
  16.   T* operator->() const { return _ptr; }
  17.   T& operator*() const { return *_ptr; }
  18.   T* get() const { return _ptr; }
  19.   void reset(T* p = nullptr) {
  20.   	if (_ptr == p) {
  21.   	  return;
  22.   	}
  23.     delete _ptr;
  24.     _ptr = p;
  25.   }
  26.  
  27.  private:
  28.   T* _ptr;
  29. };
  30.  
  31. struct ObjectCounter {
  32.   static int _object_count;
  33.   ObjectCounter() {
  34.   	++_object_count;
  35.   }
  36.   virtual ~ObjectCounter() {
  37.   	--_object_count;
  38.   }
  39. };
  40.  
  41. int ObjectCounter::_object_count = 0;
  42.  
  43. int main() {
  44.   {
  45.     scoped_ptr<ObjectCounter> ptr(new ObjectCounter());
  46.     assert(ObjectCounter::_object_count == 1);
  47.   }
  48.   assert(ObjectCounter::_object_count == 0);
  49.   return 0;
  50. }
Success #stdin #stdout 0s 15232KB
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https://ideone.com/hnxc9o
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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