debug vector move issue

[François Dumont]

Hi

     While working on debug forward_list I noticed that all debug 
containers were missing move constructor and move assignment operator 
from normal container. I started adding those and will submit a patch 
for that however there is a problem on vector. Attached is a test I 
wrote for this container.

When compiled with the necessary attached patch on debug vector it works 
fine. However when you define _GLIBCXX_DEBUG_PEDANTIC the test 
a.capacity() == r.capacity() fails. This is because when you create a 
normal vector by moving a debug one internal memory is transferred but 
the debug vector _M_guaranteed_capacity is not reseted. This result in 
the test by the moved debug vector instance 'a' announcing a capacity of 
1 when in fact it is 0.

I see no real good solution to this problem, _M_guarantied_capacity 
seemed to be impossible to maintain when the debug container is moved. 
Maybe putting this data in the allocator could help, I need to investigate.

Any thoughts ?

Francois
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