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From: "f.heckenbach@fh-soft.de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/57153] New: [C++11] tries to use copy constructor for in-class initialized member in default constructor of template struct
Date: Fri, 03 May 2013 03:03:00 -0000
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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.