From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id BE42C3857B9B; Wed, 28 Sep 2022 12:50:14 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org BE42C3857B9B DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1664369414; bh=sWSYCjiL0VshOC+tKUGrgsBUS/UoUzP09V29uRu9T7I=; h=From:To:Subject:Date:In-Reply-To:References:From; b=suLhUHkA5qHMP1lX4IwnZq+pPcodSEUB/Xm4ipOvUqlt8d2IkLK792Osu8APcnhoW GDjIXLRJ6sChia19RwsKsaCNvBxtUh0BokYx3X3S27/kZfgfIEf/nkwXNImIwsvwMo D/tLUxJM54RXy/xda9jAzvWKbodeOjvmfodlvIlU= From: "redi at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/107065] GCC treats rvalue as an lvalue Date: Wed, 28 Sep 2022 12:50:14 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: c++ X-Bugzilla-Version: 12.2.0 X-Bugzilla-Keywords: wrong-code X-Bugzilla-Severity: normal X-Bugzilla-Who: redi at gcc dot gnu.org X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 List-Id: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107065 --- Comment #4 from Jonathan Wakely --- Or as a compile-time test, not run-time: template struct is_same { static constexpr bool value =3D fal= se; }; template struct is_same { static constexpr bool value =3D tru= e; }; int main() { bool b =3D true; static_assert( is_same::value, ""); auto bb =3D (!(!b)); static_assert( is_same::value, ""); } : In function 'int main()': :5:52: error: static assertion failed 5 | static_assert( is_same::value, ""); | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~=