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From: "rs2740 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/100290] New: join_view::_Iterator::operator++ copies _M_parent->_M_inner when _S_ref_is_glvalue is false
Date: Tue, 27 Apr 2021 12:49:27 +0000	[thread overview]
Message-ID: <bug-100290-4@http.gcc.gnu.org/bugzilla/> (raw)

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100290

            Bug ID: 100290
           Summary: join_view::_Iterator::operator++ copies
                    _M_parent->_M_inner when _S_ref_is_glvalue is false
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rs2740 at gmail dot com
  Target Milestone: ---

auto&& __inner_range = [this] () -> decltype(auto) {
              if constexpr (_S_ref_is_glvalue)
                return *_M_outer;
              else
                return _M_parent->_M_inner;
            }();

This is a copy in the else case due to decltype(auto) producing the declared
type of _M_inner. The lambda should return auto&&.

             reply	other threads:[~2021-04-27 12:49 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-27 12:49 rs2740 at gmail dot com [this message]
2021-04-27 13:20 ` [Bug libstdc++/100290] " hpwxf at haveneer dot com
2021-04-27 13:37 ` ppalka at gcc dot gnu.org
2021-04-27 18:08 ` cvs-commit at gcc dot gnu.org
2021-04-27 21:24 ` cvs-commit at gcc dot gnu.org
2021-05-03 20:10 ` cvs-commit at gcc dot gnu.org
2021-05-03 20:10 ` ppalka at gcc dot gnu.org

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