Hi All,

I just started to learn a little bit of D.

I read this thread
https://github.com/dlang/dmd/pull/3998

about "Multiple alias this".

I think this feature is very handy, but dmd and gcd compilers complain that "there must be only one" alias this.

It is not clear to me if this feature is not available yet or if there was a change in the language specifications (Andrei Alexandrescu book mentions "§6.13 Multiple subtyping") ?

Does anyone has more information concerning that?

Thanks in advance,
Vincent

Dne 8.11.2016 v 11:37 Picaud Vincent via Digitalmars-d napsal(a):

> Hi All,
>
> I just started to learn a little bit of D.
>
> I read this thread
> https://github.com/dlang/dmd/pull/3998
>
> about "Multiple alias this".
>
> I think this feature is very handy, but dmd and gcd compilers complain that "there must be only one" alias this.
>
> It is not clear to me if this feature is not available yet or if there was a change in the language specifications (Andrei Alexandrescu book mentions "§6.13 Multiple subtyping") ?
>
> Does anyone has more information concerning that?
>
> Thanks in advance,
> Vincent
This feature has never been part of any D compiler.  As you can see there is a pull request 3998 which trying to add this to D frontend, but there is no activity for a few months.

Thank you for your answer, that is a sad news.

On Tuesday, 8 November 2016 at 11:26:31 UTC, Picaud Vincent wrote:
> Thank you for your answer, that is a sad news.

Yes, sad news! - 2034 A.D.

But it is coming!

On Tuesday, 8 November 2016 at 11:07:48 UTC, Daniel Kozak wrote:
> Dne 8.11.2016 v 11:37 Picaud Vincent via Digitalmars-d napsal(a):
>
>> [snip]

> This feature has never been part of any D compiler.  As you can see there is a pull request 3998 which trying to add this to D frontend, but there is no activity for a few months.

Not quite true:

https://github.com/SDC-Developers/SDC/blob/master/test/runner/test0036.d

But of course, SDC is not considered a "stable" compiler.