[Bug c++/49326] New: Lambda arguments should not have a default value

[Bug c++/49326] New: Lambda arguments should not have a default value

[vanboxem.ruben at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49326

           Summary: Lambda arguments should not have a default value
           Product: gcc
           Version: 4.6.1
            Status: UNCONFIRMED
          Severity: trivial
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: vanboxem.ruben@gmail.com


Currently, GCC 4.6.1 warns in pedantic mode when a lambda is written that
provides  default value for an argument:

[](bool a, bool=true){ return !a;} }

Which, according to the FDIS n3290 section 5.1.2/5, should be illegal and thus
give an error. 


As the detection code is already present/functional (in -pedantic mode),
changing that into an error shouldn't be hard.

[Bug c++/49326] Lambda arguments should not have a default value

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49326

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-06-08 16:50:42 UTC ---
If you get a warning with -pedantic that usually means it's a G++ extension.

If you don't want the extension use -pedantic-errors so it is rejected

[Bug c++/49326] Lambda arguments should not have a default value

[vanboxem.ruben at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49326

--- Comment #2 from Ruben Van Boxem <vanboxem.ruben at gmail dot com> 2011-06-08 16:54:34 UTC ---
I compiled with -std=c++0x, so GCC extensions should be turned off.

[Bug c++/49326] Lambda arguments should not have a default value

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49326

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-06-08 17:05:06 UTC ---
No, that's not how it works, read the manual for -std and -pedantic.

[Bug c++/49326] Lambda arguments should not have a default value

[vanboxem.ruben at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49326

Ruben Van Boxem <vanboxem.ruben at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID

--- Comment #4 from Ruben Van Boxem <vanboxem.ruben at gmail dot com> 2011-06-08 17:48:53 UTC ---
Ok, my mistake, I compiled with -std=c++0x -pedantic, which (as I'm reading in
the manual now) turns off GCC extensions and makes  program adhere to strict
standards... But emits warnings only. I should use -pedantic-errors then. OK.
That works as it should in this case. Thanks.