On Wed, Aug 4, 2021, 9:31 AM Jens Maurer via Std-Proposals <
std-proposals_at_[hidden]> wrote:

>
> In the interest of clarity, the shortest generic scope guard using
> std::unique_ptr that I've come up with so far is:
>
>
> template<class X>
> using scope_guard = std::unique_ptr<void, X>;
>
> void f()
> {
> scope_guard guard(0, [](void*) { std::cout << "hi"; });
> }
>

This is pretty neat, actually! But are you sure that unique_ptr calls its
deleter when it holds nullptr? I think you need to replace `0` with
`&guard`, or maybe replace `unique_ptr` with `shared_ptr`, in order to make
this behave correctly.

You could save one more character by changing `void*` to `auto`.

Arthur