<div dir="ltr"><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Mar 5, 2019 at 4:03 PM Richard Smith <<a href="mailto:richard@metafoo.co.uk">richard@metafoo.co.uk</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Do we anticipate implementations actually providing a chimera of<br>
different concepts proposals? Does any implementation already do so?<br></blockquote><div>I think GCC is more in danger of being a chimera.<br></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<br>
I would prefer to have only the one macro that indicates simply<br>
whether we have TS concepts or standard concepts, and to not split the<br>
hair any further unless there's actually a need to do so.<br></blockquote><div>Standard concepts currently being from 201811?<br></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<br>
On Fri, 1 Mar 2019 at 14:51, Hubert Tong<br>
<<a href="mailto:hubert.reinterpretcast@gmail.com" target="_blank">hubert.reinterpretcast@gmail.com</a>> wrote:<br>
><br>
> I believe these are meaningful as base values assuming an implementation is far enough along to set __cpp_concepts, covering `concept` versus `concept bool` and the atomic constraint matching through location + parameter mapping.<br>
><br>
> __cpp_concepts: 201507 (TS) or 201707 (P0734).<br>
> __cpp_requires_expr: 201507 (TS) or 201611 (P0266).<br>
> __cpp_compound_req: 201507 (TS) or 201707 (P0734) or 201811 (P1084). Only 201507 allows placeholder types.<br>
> __cpp_concept_placeholders: 201507 (TS) or 201811 (P1141).<br>
><br>
> On Fri, Mar 1, 2019 at 4:26 PM John Spicer <<a href="mailto:jhs@edg.com" target="_blank">jhs@edg.com</a>> wrote:<br>
>><br>
>> [ Dropping core reflector ]<br>
>><br>
>> Do you have a recommendation?<br>
>><br>
>> John.<br>
>><br>
>> On Mar 1, 2019, at 12:03 PM, Hubert Tong <<a href="mailto:hubert.reinterpretcast@gmail.com" target="_blank">hubert.reinterpretcast@gmail.com</a>> wrote:<br>
>><br>
>> I'm still hoping for some SG10 guidance on whether we want to query on what -> Concept does separately from whether Concept auto is available. There is also static_assert(C<T>) in the mix somewhere.<br>
>><br>
>> -- HT<br>
>><br>
>> On Fri, Mar 1, 2019 at 8:45 AM John Spicer <<a href="mailto:jhs@edg.com" target="_blank">jhs@edg.com</a>> wrote:<br>
>>><br>
>>> That seems appropriate to me (copying the core reflector).<br>
>>><br>
>>> John.<br>
>>><br>
>>> > On Mar 1, 2019, at 7:21 AM, Jonathan Wakely <<a href="mailto:cxx@kayari.org" target="_blank">cxx@kayari.org</a>> wrote:<br>
>>> ><br>
>>> > The working draft doesn't specify a __cpp_concepts macro. I want to know if I need to say "concept bool" or just "concept", so I expected to be able to do:<br>
>>> ><br>
>>> > #if __cpp_concepts<br>
>>> > template<typename T><br>
>>> > concept<br>
>>> > #if __cpp_concepts <= 201507<br>
>>> > bool<br>
>>> > #endif<br>
>>> > Foo = ...;<br>
>>> > #endif<br>
>>> ><br>
>>> > Should this be handled by a core issue?<br>
>>> ><br>
>>> > _______________________________________________<br>
>>> > Features mailing list<br>
>>> > <a href="mailto:Features@isocpp.open-std.org" target="_blank">Features@isocpp.open-std.org</a><br>
>>> > <a href="http://www.open-std.org/mailman/listinfo/features" rel="noreferrer" target="_blank">http://www.open-std.org/mailman/listinfo/features</a><br>
>>><br>
>>> _______________________________________________<br>
>>> Features mailing list<br>
>>> <a href="mailto:Features@isocpp.open-std.org" target="_blank">Features@isocpp.open-std.org</a><br>
>>> <a href="http://www.open-std.org/mailman/listinfo/features" rel="noreferrer" target="_blank">http://www.open-std.org/mailman/listinfo/features</a><br>
>><br>
>><br>
> _______________________________________________<br>
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</blockquote></div></div>