const and immutable values, D vs C++?

[Ola Fosheim Grøstad]

On Wednesday, 4 December 2019 at 23:27:49 UTC, Steven 
Schveighoffer wrote:
> void main()
> {
>     foo!a(); // const(int)
>     foo!b(); // immutable(int)
>     foo!c(); // const(int)
> }

Ok, so one has to use a wrapper and then "catch" the result with 
auto?

auto x = foo!f();