libstdc++/7186: DR179 for std::deque::iterator and const_iterator

[Paolo Carlini]

bkoz@gcc.gnu.org wrote:

>    Is there a survey of existing practice for this issue?
>
Agreed, I'm going to take care of this, surveying the existing practice 
of 3 or 4 implementations I have access too.

> Can all but the reverse_iterator bits go in now, since that will have ABI-impacting effects?
>
Well, as I mentioned in the PR, decoupling the reverse_iterator case 
from the "normal" iterator case seems difficult for the special 
std::deque::iterator and const_iterator case (it isn't for 
__normal_iterator, used by the other standard containers). Again, I will 
do my best in the next weeks.

Paolo.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=7186