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From: "rs2740 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/100823] New: Special member functions of
 common_iterator should be conditionally trivial
Date: Sat, 29 May 2021 05:47:30 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100823

            Bug ID: 100823
           Summary: Special member functions of common_iterator should be
                    conditionally trivial
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rs2740 at gmail dot com
  Target Milestone: ---

At least as a QoI matter, the special member functions of common_iterator<I=
, S>
should be trivial when the corresponding special member function of variant=
<I,
S> is. Given that the standard depicts a variant<I, S> exposition-only memb=
er
with implicitly declared special member functions, it is arguable that this=
 is
actually required.

There appears to be a couple other conformance issues too:

- the move special members are missing
- the copy assignment calls the converting assignment operator, but unlike =
the
latter, there's no !valueless_by_exception() precondition on the (implicitly
declared) copy assignment.=