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From: "m.cencora at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/113219] New: Overloaded ref-qualified conversion operator
 triggers bogus -Wconversion
Date: Wed, 03 Jan 2024 16:38:09 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 13.0
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: m.cencora at gmail dot com
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113219

            Bug ID: 113219
           Summary: Overloaded ref-qualified conversion operator triggers
                    bogus -Wconversion
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: m.cencora at gmail dot com
  Target Milestone: ---

Following code when compiled on any gcc version (checked all available on
godbolt since gcc-7) triggers conversion warnings.
I consider it bogus because it tells user that it has chosen a better overl=
oad
(which is good thing, right?).
Clang doesn't print any related warning even with -Weverything

g++ -std=3Dc++17 -Wconversion

template <typename T>
struct wrapper
{
    operator T() const&;

    operator T&&() &&;
};

wrapper<int> createInt();

int test()
{
    return createInt();
}

Output is:
<source>:13:21: warning: choosing 'wrapper<T>::operator T&&() && [with T =3D
int]' over 'wrapper<T>::operator T() const & [with T =3D int]' [-Wconversio=
n]
   13 |     return createInt();
      |            ~~~~~~~~~^~
<source>:13:21: warning:   for conversion from 'wrapper<int>' to 'int'
[-Wconversion]
<source>:13:21: note:   because conversion sequence for the argument is bet=
ter=