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From: "jason at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/81420] When a reference is bound to a member in the base of
 a temporary, lifetime of the temporary is not extended
Date: Fri, 11 Aug 2023 20:35:11 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 8.0
X-Bugzilla-Keywords: wrong-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: jason at gcc dot gnu.org
X-Bugzilla-Status: RESOLVED
X-Bugzilla-Resolution: FIXED
X-Bugzilla-Priority: P3
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X-Bugzilla-Target-Milestone: 8.2
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D81420

Jason Merrill <jason at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED
   Target Milestone|---                         |8.2

--- Comment #8 from Jason Merrill <jason at gcc dot gnu.org> ---
(In reply to Ion Lupascu from comment #7)
> Not really, The issue still persists
>=20
> std::optional<double> getValue(){
...
>     const double &v =3D *getValue();
...
>     const double &v =3D getValue()->v;

Neither of these bind the reference to a prvalue; std::optional operator*
returns a reference, and operator-> returns a pointer, so in both cases we'=
re
binding the reference to an xvalue, and GCC is correct not to extend the
temporary.

Fixed in 8.2.=