Use RAII with factory taking as input a reference to pointer

Question

I have a function which construct an object, and it takes as input a reference to pointer:

void generator(Object*&)

and I call it as:

Object* obj = nullptr;
generator(obj);

...
use obj
...
delete obj;

As you can see the user is responsible for the destruction of obj . Is there a better way to use smart pointers or other solution to avoid to manual memory management?

I cannot change the generator function.

Answer 1

Even if you can't modify generator :(, you can still use smart pointer:

Object* obj = nullptr;
generator(obj);
std::unique_ptr<Object> raii_obj(obj);
...
use obj/raii_obj
...
// auto delete raii_obj.

And you can even wrap it in a function:

std::unique_ptr<Object> make_object()
{
    Object* obj = nullptr;
    generator(obj);
    return std::unique_ptr<Object>(obj);
}