forward_list debug swap

[François Dumont]

Hi

     I still don't feel comfortable with current implementation of debug 
foward_list swap regarding management of before_begin iterators. I know 
that you are supposed to talk about it Paolo with LWG guys on next 
meeting but waiting for it I would prefer to apply a patch so that 
normal and debug mode are behaving consistently.

     This is why I would like to propose the attached patch which is a 
revisited shorter version of the one I submitted some weeks ago. You 
will see that thanks to this patch I have been able to remove the ugly 
#if !_GLIBCXX_DEBUG in the swap.cc test case.

2011-01-04  François Dumont <xxxx@free.fr>

     * include/debug/safe_base.h (_Safe_iterator_base::_M_unlink): New.
     * include/src/debug.cc: Use latter
     * include/debug/forward_list (forward_list<>::_M_swap):  Fix to 
correctly
     handle before_begin iterators.

Regards


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