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From: "MikeSmith32564 at mail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/109172] New: g++ calls a private destructor with the
 keyword throw after the try-block
Date: Fri, 17 Mar 2023 11:39:43 +0000
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X-Bugzilla-Version: 13.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109172

            Bug ID: 109172
           Summary: g++ calls a private destructor with the keyword throw
                    after the try-block
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: MikeSmith32564 at mail dot com
  Target Milestone: ---

Created attachment 54692
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D54692&action=3Dedit
Bug example

In the attached example an instance of class Demo is constructed in-place i=
n a
buffer by following the natural alignment of Demo and then this instance is
passed to throw.
Note that Demo has a private destructor. The expected behavior when buildin=
g is
that g++ should return a compilation error because a private destructor can=
not
be called
outisde of the class Demo or outside of friend declarations. The actual
behavior is that the example builds successfully when

g++ -std=3Dc++11 ./main.cpp -o ./main

is used, producing the following output:

Demo(), id =3D 1
Demo(const Demo&) called, this->id =3D 2, other.id =3D 1
in catch, e.id =3D 2
~Demo(), id =3D 2
main ends here

If the destructor is instead declared as deleted the example fails to compi=
le
as expected:

main.cpp: In function 'int main()':
main.cpp:69:10: error: use of deleted function 'Demo::~Demo()'
   throw *d;
          ^

main.cpp:61:2: note: declared here
  ~Demo() =3D delete;
  ^=