unordered containers: reuse nodes on assignment

[François Dumont]

On 07/01/2013 11:35 PM, Paolo Carlini wrote:
> On 07/01/2013 09:35 PM, François Dumont wrote:
>> This is it indeed, I am surprised this problem is so old, a Standard 
>> issue perhaps ? If not I might add it to my todo list.
> Yesterday I had a look and I think it's just a bug, I found in 
> Bugzilla a duplicate too, and another resolved Jon some time ago.
>
> Paolo.
>
It doesn't seem to be resolved.

And about the patch itself, is it ok ? I only noticed that some lambdas 
I was using didn't need to capture 'this' so I clean it and here is the 
updated version of the patch.

Tested under linux x86_64.

François
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