On Tue, Aug 16, 2022 at 5:38 PM Lénárd Szolnoki via Std-Proposals wrote:
>
> Yeah, I would like a placeholder name proposal. A way to introduce an entity that can't be referred to, but otherwise behaves identically to a named entity of the same kind. It would be useful for structured bindings, lock guards, macros. It also doesn't share the ODR-violation footgun with __COUNTER__ .


__COUNTER__ is handy when you want to instantiate a template. So let's
say the template is:

        template<unsigned i>
        SomeClass &Func(void)
        {
               static SomeClass obj;
               return obj;
        }

and then I can do this:

        int main(void)
        {
               SomeClass &objA = Func< __COUNTER__ >();
               SomeClass &objB = Func< __COUNTER__ >();
               SomeClass &objC = Func< __COUNTER__ >();
               SomeClass &objD = Func< __COUNTER__ >();
               SomeClass &objE = Func< __COUNTER__ >();

               assert( &objA != &objE );
        }