Perfect forwarding

[Stefan Koch]

On Sunday, 26 July 2020 at 01:29:21 UTC, Andrei Alexandrescu 
wrote:
> This topic came about during beerconf (it was fun!): Write an 
> idiomatic template `forward` that takes an alias `fun` and 
> defines (generates) one overload for each overload of `fun`. 
> Example:
>
> template forward(alias fun)
> {
>     ...
> }
>
> Now for this function:
>
> void myfun(int, ref double, out string);
> int myfun(in string, inout double);
>
> the instantiation would be (stylized):
>
> template forward!myfun
> {
>     void myfun(int a, ref double b, out string c)
>     {
>         return myfun(a, b, c);
>     }
>     int myfun(in string a, inout double b)
>     {
>         return myfun(a, b);
>     }
> }
>
> So the challenge is implementing forward() to do this.

I would be interested an actual use-cases for this?

Where would you use, forward? Where would it be the most pleasant 
solution, and others would be vastly inferior?