PR libstdc++/60587

[Paolo Carlini]

Hi

> On 19/mar/2014, at 23:28, Jonathan Wakely <jwakely@redhat.com> wrote:
> 
>> On 19/03/14 21:39 +0000, Jonathan Wakely wrote:
>> I think the safe thing to do is (as I suggested at the time) to have a
>> trait saying which iterator types refer to contiguous memory. Our
>> debug mode only supports our own containers, so the ones which are
>> contiguous are known.  For 4.9.0 I think the right option is simply
>> to remove __foreign_iterator_aux3 and __foreign_iterator_aux4
>> completely. The fixed version of __foreign_iterator_aux2() can detect
>> when we have iterators referring to the same sequence, which is what
>> we really want to detect. That's what the attached patch does and what
>> I'm going to test.
> 
> With my suggested change we get an XPASS for
> testsuite/23_containers/vector/debug/57779_neg.cc
> 
> An __is_contiguous trait would solve that.

Funny, I thought we already had it...

Paolo