From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id B30043858C83; Tue, 14 Mar 2023 09:50:57 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org B30043858C83 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1678787457; bh=UlZtNDIJI5LVLlsVGW+HhB/bnzKvMFb2st9r4fOp6Xk=; h=From:To:Subject:Date:In-Reply-To:References:From; b=aH0AA7xkTGi58y6to8MkWkJlnwDm4TIrac7LZFWAyTj5QRG05kmNA0FNi9xA2n0Dv xWERKTsT2FwcgDhmEvxTAVi5r4cFMWODyK5ZnkYa0InxHJR6UmkWqB+g2Eu93fLHyi 6gsIcCaMZ5DS9ZcPNMhDbnyoLNMVZ/05RYm3yoYg= From: "redi at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/85270] Trivial assignment operator not considered such Date: Tue, 14 Mar 2023 09:50:55 +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: 8.0 X-Bugzilla-Keywords: rejects-valid, 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: see_also cf_reconfirmed_on 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=3D85270 Jonathan Wakely changed: What |Removed |Added ---------------------------------------------------------------------------- See Also| |https://gcc.gnu.org/bugzill | |a/show_bug.cgi?id=3D87051 Last reconfirmed|2021-12-28 00:00:00 |2023-3-14 --- Comment #2 from Jonathan Wakely --- This breaks std::tuple<> due to new assignment operators in C++23: https://godbolt.org/z/9EdPrdjhW #include template struct tuple; template <> struct tuple<> { tuple() =3D default; ~tuple() =3D default; tuple(const tuple&) =3D default; tuple(tuple&&) =3D default; tuple& operator=3D(const tuple&) =3D default; tuple& operator=3D(tuple&&) =3D default; constexpr const tuple& operator=3D(const tuple&) const noexcept { return *this; } constexpr const tuple& operator=3D(tuple&&) const noexcept { return *th= is; } }; static_assert(std::is_trivially_destructible_v>); static_assert(std::is_trivially_default_constructible_v>); static_assert(std::is_trivially_copy_constructible_v>); static_assert(std::is_trivially_move_constructible_v>); static_assert(std::is_trivially_copy_assignable_v>); static_assert(std::is_trivially_move_assignable_v>); static_assert(!std::is_trivially_copyable_v>); :23:20: error: static assertion failed 23 | static_assert(std::is_trivially_copy_assignable_v>); | ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ :24:20: error: static assertion failed 24 | static_assert(std::is_trivially_move_assignable_v>); | ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Compiler returned: 1=