On 04/08/2021 15.48, Arthur O'Dwyer wrote:

On Wed, Aug 4, 2021, 9:31 AM Jens Maurer via Std-Proposals <std-proposals@lists.isocpp.org <mailto:std-proposals@lists.isocpp.org>> 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`,

Yes, I guess that's correct.

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

Yes.

Jens


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