[Bug c++/49924] New: [C++0X] [constexpr] can't initialize a non-static member array of a literal type as a constexpr

[Bug c++/49924] New: [C++0X] [constexpr] can't initialize a non-static member array of a literal type as a constexpr

[faisalv at yahoo dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49924

           Summary: [C++0X] [constexpr] can't initialize a non-static
                    member array of a literal type as a constexpr
           Product: gcc
           Version: 4.6.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: faisalv@yahoo.com


I believe the following code should compile:

struct A { constexpr A() { } };

struct B {  
    A array[1]; //non-static member array of a literal type w constexpr ctor
    constexpr B() : array{} { } // here is the problem 
};

int main()
{
  constexpr B b{};  // won't compile
}

But i get the following output with g++4.6.1:
<output>
In function 'int main()':
<file>.cpp:11:17: error: '{{{A()}}}' is not a constant expression
</output>

FYI, the following does compile:
int main() { constexpr A a[1]{}; }


Thanks!
p.s


My gcc -v output is:
Using built-in specs.
COLLECT_GCC=g++-4.6.1
COLLECT_LTO_WRAPPER=/usr/local/gcc4.6.1/libexec/gcc/i686-pc-linux-gnu/4.6.1/lto-wrapper
Target: i686-pc-linux-gnu
Configured with: ../gcc-4.6.1/configure --prefix=/usr/local/gcc4.6.1
--enable-generated-files-in-srcdir --enable-threads=posix --with-system-zlib
--enable-__cxa_atexit --disable-checking --disable-nls --enable-bootstrap
--with-gcc --with-gnu-as --with-gnu-ld --disable-multilib
Thread model: posix
gcc version 4.6.1 (GCC)

[Bug c++/49924] [C++0X] [constexpr] can't initialize a non-static member array of a literal type as a constexpr

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49924

Jason Merrill <jason at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2011.08.01 18:37:43
         AssignedTo|unassigned at gcc dot       |jason at gcc dot gnu.org
                   |gnu.org                     |
     Ever Confirmed|0                           |1

[Bug c++/49924] [C++0X] [constexpr] can't initialize a non-static member array of a literal type as a constexpr

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49924

--- Comment #1 from Jason Merrill <jason at gcc dot gnu.org> 2011-08-01 21:02:02 UTC ---
Author: jason
Date: Mon Aug  1 21:01:59 2011
New Revision: 177073

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=177073
Log:
    PR c++/49924
    * semantics.c (cxx_eval_vec_init_1): Fix logic.

Added:
    trunk/gcc/testsuite/g++.dg/cpp0x/constexpr-array4.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/semantics.c
    trunk/gcc/testsuite/ChangeLog

[Bug c++/49924] [C++0X] [constexpr] can't initialize a non-static member array of a literal type as a constexpr

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49924

Jason Merrill <jason at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED
   Target Milestone|---                         |4.6.2

--- Comment #3 from Jason Merrill <jason at gcc dot gnu.org> 2011-08-02 15:37:15 UTC ---
Fixed for 4.6.2.

[Bug c++/49924] [C++0X] [constexpr] can't initialize a non-static member array of a literal type as a constexpr

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49924

--- Comment #2 from Jason Merrill <jason at gcc dot gnu.org> 2011-08-02 15:35:38 UTC ---
Author: jason
Date: Tue Aug  2 15:35:34 2011
New Revision: 177188

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=177188
Log:
    PR c++/49924
    * semantics.c (cxx_eval_vec_init_1): Fix logic.

Added:
    branches/gcc-4_6-branch/gcc/testsuite/g++.dg/cpp0x/constexpr-array4.C
Modified:
    branches/gcc-4_6-branch/gcc/cp/ChangeLog
    branches/gcc-4_6-branch/gcc/cp/semantics.c
    branches/gcc-4_6-branch/gcc/testsuite/ChangeLog

[Bug c++/49924] [C++0X] [constexpr] can't initialize a non-static member array of a literal type as a constexpr

[faisalv at yahoo dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49924

--- Comment #4 from Faisal Vali <faisalv at yahoo dot com> 2011-08-02 16:15:18 UTC ---
wow - that was quick - thank you Jason!!