学步园

template<class _Ty>
 class auto_ptr
  { // wrap an object pointer to ensure destruction
public:
 typedef _Ty element_type;

 explicit auto_ptr(_Ty *_Ptr = 0) _THROW0()
  : _Myptr(_Ptr)
  { // construct from object pointer
  }

 auto_ptr(auto_ptr<_Ty>& _Right) _THROW0()
  : _Myptr(_Right.release())
  { // construct by assuming pointer from _Right auto_ptr
  }

 auto_ptr(auto_ptr_ref<_Ty> _Right) _THROW0()
  : _Myptr(_Right._Ref.release())
  { // construct by assuming pointer from _Right auto_ptr_ref
  }

 template<class _Other>
  operator auto_ptr<_Other>() _THROW0()
  { // convert to compatible auto_ptr
  return (auto_ptr<_Other>(*this));
  }

 template<class _Other>
  operator auto_ptr_ref<_Other>() _THROW0()
  { // convert to compatible auto_ptr_ref
  return (auto_ptr_ref<_Other>(*this));
  }

 template<class _Other>
  auto_ptr<_Ty>& operator=(auto_ptr<_Other>& _Right) _THROW0()
  { // assign compatible _Right (assume pointer)
  reset(_Right.release());
  return (*this);
  }

 template<class _Other>
  auto_ptr(auto_ptr<_Other>& _Right) _THROW0()
  : _Myptr(_Right.release())
  { // construct by assuming pointer from _Right
  }

 auto_ptr<_Ty>& operator=(auto_ptr<_Ty>& _Right) _THROW0()
  { // assign compatible _Right (assume pointer)
  reset(_Right.release());
  return (*this);
  }

 auto_ptr<_Ty>& operator=(auto_ptr_ref<_Ty>& _Right) _THROW0()
  { // assign compatible _Right._Ref (assume pointer)
  reset(_Right._Ref.release());
  return (*this);
  }

 ~auto_ptr()
  { // destroy the object
  delete _Myptr;
  }

 _Ty& operator*() const _THROW0()
  { // return designated value
  return (*_Myptr);
  }

 _Ty *operator->() const _THROW0()
  { // return pointer to class object
  return (&**this);
  }

 _Ty *get() const _THROW0()
  { // return wrapped pointer
  return (_Myptr);
  }

 _Ty *release() _THROW0()
  { // return wrapped pointer and give up ownership
  _Ty *_Tmp = _Myptr;
  _Myptr = 0;
  return (_Tmp);
  }

 void reset(_Ty* _Ptr = 0)
  { // destroy designated object and store new pointer
  if (_Ptr != _Myptr)
   delete _Myptr;
  _Myptr = _Ptr;
  }

private:
 _Ty *_Myptr; // the wrapped object pointer
 };