Please see the 2018 thread below. I think this macro should be added to SD-6 and the IS, and I think it should also be updated to 201811L for the P1032R1 "Misc constexpr bits" changes that made the remaining char_traits members constexpr. All the other bits of P1032R1 have their own macro now instead of __cpp_lib_constexpr_misc, but not the char_traits bits.
Libstdc++ has been defining __cpp_lib_constexpr_char_traits to 201611 for years (and I'm about to update the value to 201811 in the relevant branches). Any objection before I open an LWG issue? ---------- Forwarded message --------- From: Richard Smith <[email protected]> Date: Fri, 15 Jun 2018 at 19:41 Subject: Re: [SG10] Is __cpp_lib_constexpr_char_traits "official"? To: Jonathan Wakely <[email protected]> Cc: [email protected] ([email protected]) < [email protected]> It seems reasonable to me, at least. On 15 June 2018 at 17:30, Jonathan Wakely <[email protected]> wrote: > I don't see it in P0096R5, although > http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0426r1.html > recommended it. > > It seems to be useful to know whether you can use > char_traits<char>::length() in a constexpr function, or whether you need to > write your own. > > > > _______________________________________________ > Features mailing list > [email protected] > http://www.open-std.org/mailman/listinfo/features > >
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