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From: "jack.cui2 at foxmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/110195] New: defaulted constructor does not respect the
 private accessor
Date: Fri, 09 Jun 2023 15:21:53 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 13.1.0
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: jack.cui2 at foxmail dot com
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110195

            Bug ID: 110195
           Summary: defaulted constructor does not respect the private
                    accessor
           Product: gcc
           Version: 13.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jack.cui2 at foxmail dot com
  Target Milestone: ---

class Single
{
private:
    Single() =3D default;
};

auto s1 =3D Single{}; // compiles fine with c++11,14,17. Compilation error =
with
c++20. Unexpected.
auto s2 =3D Single(); // compilation error. expected behavior.
Single s3;          // compilation error. expected behavior.

----------------------------
but with

class Single
{
private:
    explicit Single() =3D default;
};

or

class Single
{
private:
    Single() {}
};

auto s1 =3D Single{}; // compilation error. expected behavior.
auto s2 =3D Single(); // compilation error. expected behavior.
Single s3;          // compilation error. expected behavior.=