template<class _Ty1,
	class _Ty2>
	shared_ptr<_Ty1> static_pointer_cast(const shared_ptr<_Ty2>& _Other)
	{	// return shared_ptr object holding static_cast<_Ty1 *)(_Other.get())
	return (shared_ptr<_Ty1>(_Other, _Static_tag()));
	}

template<class _Ty1,
	class _Ty2>
	shared_ptr<_Ty1> const_pointer_cast(const shared_ptr<_Ty2>& _Other)
	{	// return shared_ptr object holding const_cast<_Ty1 *)(_Other.get())
	return (shared_ptr<_Ty1>(_Other, _Const_tag()));
	}

template<class _Ty1,
	class _Ty2>
	shared_ptr<_Ty1> dynamic_pointer_cast(const shared_ptr<_Ty2>& _Other)
	{	// return shared_ptr object holding dynamic_cast<_Ty1*)(_Other.get())
	return (shared_ptr<_Ty1>(_Other, _Dynamic_tag()));
	}
 

可以用於智慧指標父類與子類之間的轉換。