<div dir="ltr"><div>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></div><div><br></div><div>__cpp_concepts: 201507 (TS) or 201707 (P0734).<br></div><div>__cpp_requires_expr: 201507 (TS) or 201611 (P0266).<br></div><div>__cpp_compound_req: 201507 (TS) or 201707 (P0734) or 201811 (P1084). Only 201507 allows placeholder types.<br></div><div>__cpp_concept_placeholders: 201507 (TS) or 201811 (P1141).<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Mar 1, 2019 at 4:26 PM John Spicer <<a href="mailto:jhs@edg.com">jhs@edg.com</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"><div style="overflow-wrap: break-word;">[ Dropping core reflector ]<div><br></div><div>Do you have a recommendation?</div><div><br></div><div>John.<br><div><br><blockquote type="cite"><div>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:</div><br class="gmail-m_1806568657013110618Apple-interchange-newline"><div><div dir="ltr"><div>I'm still hoping for some SG10 guidance on whether we want to query on what <span style="font-family:monospace,monospace">-></span> <i>Concept</i> does separately from whether <i>Concept</i> <span style="font-family:monospace,monospace">auto</span> is available. There is also <span style="font-family:monospace,monospace">static_assert(C<T>)</span> in the mix somewhere.</div><div><br></div><div>-- HT<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">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></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">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>
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