<div dir="ltr"><div><div>Hi Hannes,<br><br></div>At this time, I have been working on Concepts in Clang. I am not sure how "people" are using concepts in GCC, but my experience on unit testing produced a number of internal compiler errors (and I have not found the error messages to be helpful in general). Some cases of those internal compiler errors stem from the cases being underspecified in the TS.<br><br></div><div>I am not sure an ETA makes sense if the shape of what is going to be delivered is changing. For example, the TS has a one-size-fits-all normalization process which can be overly eager; part of the Clang implementation effort would be to implement (in consultation with the committee) the intended behaviour for each of the uses of normalization.<br><br></div><div>-- HT<br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Feb 9, 2017 at 3:17 PM, Hannes Hauswedell <span dir="ltr"><<a href="mailto:h2+lists2017@fsfe.org" target="_blank">h2+lists2017@fsfe.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi Hubert,<br>
<br>
thanks for the reply and the "warning sign". I am aware that the<br>
discussion on Concepts is ongoing, but there is the published ISO/IEC TS<br>
19217:2015 that GCC implements and it has been rather stable from my<br>
knowledge.<br>
In any case my original question still remains: is there an ETA for<br>
concepts in Clang? Is there a person responsible for it right now that<br>
could have more details?<br>
<br>
Thanks,<br>
<span class="im HOEnZb">Hannes<br>
--<br>
pgp-key: <a href="https://hannes.hauswedell.net/hannes_hauswedell_public_key.asc" rel="noreferrer" target="_blank">https://hannes.hauswedell.net/<wbr>hannes_hauswedell_public_key.<wbr>asc</a><br>
fingerprint: FC35 7547 7916 DA55 DC42 27EA 1D57 8E18 A109 60BF<br>
<br>
</span><div class="HOEnZb"><div class="h5">On 05.02.2017 18:57, Hubert Tong wrote:<br>
> The Concepts TS implementation for Clang is occurring on trunk; so you are<br>
> looking in the right place.<br>
> Regardless of the implementation status in Clang, the TS remains an<br>
> experimental design, which may be subject to change.<br>
> So, I think that using relying on the Concepts TS in production carries<br>
> some risks: even if the support is there, it might not be the same as GCC<br>
> or the current version of the TS.<br>
><br>
> -- HT<br>
><br>
> On Sun, Feb 5, 2017 at 8:43 AM, Hannes Hauswedell via cfe-dev <<br>
> <a href="mailto:cfe-dev@lists.llvm.org">cfe-dev@lists.llvm.org</a>> wrote:<br>
><br>
>> Hi everyone,<br>
>><br>
>> I wanted to ask what the current state of the Concepts TS is in Clang. I<br>
>> saw some older list threads last year, but also didn't see much in<br>
>> regard of commits, but maybe I am also looking in the wrong places.<br>
>><br>
>> The status page lists it as WIP, but from my own experience I know that<br>
>> WIP can me anything from "we are running the last tests before release"<br>
>> to "I have put it on the TODO list".<br>
>><br>
>> The background is that we are currently redesigning a large template<br>
>> library and would really like to make use of concepts. Working with GCC<br>
>> during development is not a problem, but when we start distributing<br>
>> first release candidates maybe a year from now, it would be important to<br>
>> have Clang support, too.<br>
>><br>
>> If someone could shed light on the current status and whether there is<br>
>> an ETA that would help us a lot. Note that I am not implying that anyone<br>
>> should do anything for us, it's just important for us to know whether<br>
>> it's something we can likely expect for e.g. clang-6 or "definetely not<br>
>> in the next two years".<br>
>><br>
>> Thank you,<br>
>> Hannes<br>
>> --<br>
>> pgp-key: <a href="https://hannes.hauswedell.net/hannes_hauswedell_public_key.asc" rel="noreferrer" target="_blank">https://hannes.hauswedell.net/<wbr>hannes_hauswedell_public_key.<wbr>asc</a><br>
>> fingerprint: FC35 7547 7916 DA55 DC42 27EA 1D57 8E18 A109 60BF<br>
>><br>
>><br>
>> ______________________________<wbr>_________________<br>
>> cfe-dev mailing list<br>
>> <a href="mailto:cfe-dev@lists.llvm.org">cfe-dev@lists.llvm.org</a><br>
>> <a href="http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-dev" rel="noreferrer" target="_blank">http://lists.llvm.org/cgi-bin/<wbr>mailman/listinfo/cfe-dev</a><br>
>><br>
>><br>
><br>
<br>
<br>
</div></div></blockquote></div><br></div>