<div dir="ltr">We haven't had a __cpp_concepts since the TS specified its value as 201507 - which GCC defines. I've been making up values since then for various compilers which cmcstl2 supports to various degrees: <div>* clang-concepts defines __cpp_concepts to 201707L - the date of the Toronto merge - to indicate support for concepts as merged.</div><div>* MSVC uses 201811L - the date of the P1084 merge - to indicate that it supports the above plus P1084's changes to return-type-requirements. (Unfortunately MSVC does not yet support the changes in P1141 which were merged at the same meeting.)</div><div><br></div><div>I'd appreciate a bump for the changes in Cologne. P1452 seems significant enough to me, but regardless it would be nice to have a way to discriminate between what MSVC will support in 16.3 and C++20 concepts' final form.</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Sep 16, 2019 at 8:26 AM 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;">Yes, I think we should have one.<div><br></div><div>John.<br><div><br><blockquote type="cite"><div>On Sep 14, 2019, at 4:07 PM, Barry Revzin <<a href="mailto:barry.revzin@gmail.com" target="_blank">barry.revzin@gmail.com</a>> wrote:</div><br><div><div dir="auto"><div><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Sep 14, 2019, 2:38 PM Jason Merrill via Core <<a href="mailto:core@lists.isocpp.org" target="_blank">core@lists.isocpp.org</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">This doesn't seem to have been addressed at Cologne. I don't think<br>
any of the changes at Cologne (conditionally trivial, unconstrained<br>
TTP, dropping return-type requirements) require a version bump, does<br>
anyone else?<br>
<br>
So I'd stick with the 201811 value.<br>
<br>
Jason<br></blockquote></div></div><div dir="auto"><br></div><div dir="auto">Wait, do we even have a __cpp_concepts? We have a __cpp_lib_concepts (... that def needs to be bumped to 201907), but not one for the language. We should add one...</div><div dir="auto"><br></div><div dir="auto">Barry</div><div dir="auto"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
</blockquote></div></div></div>
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