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From: "ppalka at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/101263] non-propagating-cache::emplace-deref missing
 constexpr
Date: Tue, 13 Jul 2021 17:45:57 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101263

Patrick Palka <ppalka at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
           Assignee|unassigned at gcc dot gnu.org      |ppalka at gcc dot g=
nu.org
   Last reconfirmed|                            |2021-07-13
                 CC|                            |ppalka at gcc dot gnu.org
             Status|UNCONFIRMED                 |ASSIGNED

--- Comment #1 from Patrick Palka <ppalka at gcc dot gnu.org> ---
It looks like emplace-deref was made constexpr in R1 of the paper, but we  =
only
implemented R0.  Fortunately this added constexpr seems to be the only
functional change in R1 vs R0.

We might first need to implement P2231 (for constexpr optional) before this
function can be properly constexpr.=