[Bug c++/57153] New: [C++11] tries to use copy constructor for in-class initialized member in default constructor of template struct

[Bug c++/57153] New: [C++11] tries to use copy constructor for in-class initialized member in default constructor of template struct

[f.heckenbach@fh-soft.de]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57153

             Bug #: 57153
           Summary: [C++11] tries to use copy constructor for in-class
                    initialized member in default constructor of template
                    struct
    Classification: Unclassified
           Product: gcc
           Version: 4.7.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: f.heckenbach@fh-soft.de


Created attachment 30014
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30014
Test case

The included test case produces the following error:

% g++-4.7 -std=c++11 test.cpp 
test.cpp: In constructor 'constexpr B<0>::B()':
test.cpp:8:8: error: use of deleted function 'A::A(const A&)'
test.cpp:4:3: error: declared here
test.cpp: In function 'int main()':
test.cpp:17:9: note: synthesized method 'constexpr B<0>::B()' first required
here 

I don't think a copy constructor of the member should be needed for the default
constructor of the containing struct.

The error disappears when I declare the latter explicitly, but not when I
declare it as "= default".

Is also disappears if struct B is not a template. I don't see why this should
make a difference.

[Bug c++/57153] [C++11] tries to use copy constructor for in-class initialized member in default constructor of template struct

[daniel.kruegler at googlemail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57153

Daniel Krügler <daniel.kruegler at googlemail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |daniel.kruegler at
                   |                            |googlemail dot com

--- Comment #1 from Daniel Krügler <daniel.kruegler at googlemail dot com> 2013-05-06 12:09:34 UTC ---
I agree that the code should be accepted, because the member initializer
performs direct-initialization. The very same problem also exists for gcc 4.9.0
20130428 (experimental).
>From gcc-bugs-return-421693-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon May 06 12:16:16 2013
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From: "paolo.carlini at oracle dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/57183] [C++11] auto and -Wunused-variable
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idW183

Paolo Carlini <paolo.carlini at oracle dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
         AssignedTo|unassigned at gcc dot       |paolo.carlini at oracle dot
                   |gnu.org                     |com
   Target Milestone|---                         |4.8.1

--- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> 2013-05-06 12:16:12 UTC ---
I have a patch.

[Bug c++/57153] [C++11] tries to use copy constructor for in-class initialized member in default constructor of template struct

[paolo.carlini at oracle dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57153

Paolo Carlini <paolo.carlini at oracle dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
      Known to work|                            |4.9.1, 5.0
         Resolution|---                         |FIXED

--- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> ---
This is fixed in 4.9.1.

[Bug c++/57153] [C++11] tries to use copy constructor for in-class initialized member in default constructor of template struct

[paolo.carlini at oracle dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57153

Paolo Carlini <paolo.carlini at oracle dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |4.9.1